カスタムCSSを追加することで、サイトのレイアウトや外観を標準のオプション以上に変更することができます。フォントや色、スペーシングやアニメーションなど、すべてをパーソナライズすることができ、クリエイティブを完全にコントロールすることができます。
以前は、WordPressユーザーはカスタムCSSを追加するためにテーマファイルを直接編集しなければなりませんでした。そのため、私たちは自分たちのブログの旅の間に、代替手段を探し始めたのです。
幸いなことに、テーマカスタマイザーやコードスニペットプラグイン、専用のCSSプラグインを使用するなど、より簡単でユーザーフレンドリーなカスタムCSSの追加方法があります。
この投稿では、テーマファイルを編集することなく、WordPressサイトにカスタマイザーを簡単に追加する方法を紹介する。
なぜWordPressにカスタムCSSを追加するのか？
CSSとは、Cascading Style Sheets（カスケーディング・スタイル・シート）の略で、WordPressサイトのスタイル設定に役立つ言語です。CSSは、色、サイズ、レイアウト、表示など、さまざまなHTML要素をスタイル設定するために使用されるため、CSSとHTMLは密接な関係にあります。
カスタムCSSを追加することで、初期設定では不可能なサイトのデザインや外観のカスタマイズが可能になります。よりコントロールしやすくなり、数行のコードでWordPressテーマを簡単にカスタマイズできます。
例えば、サイト全体で同じ色を使用する代わりに、個々の投稿の背景色を変更したいとします。カスタムCSSコードを追加することで、特定の投稿やページの背景をパーソナライズすることができます。
同様に、追加CSSを使用して、eコマースストアの商品カテゴリーのスタイルや外観を変更することができます。
以下のセクションでは、WordPressサイトにカスタムCSSを追加するさまざまな方法について説明します。下のリンクをクリックすると、興味のあるセクションにジャンプできます：
準備はいいかい？始めよう
方法1：テーマ・カスタマイザーを使ってカスタムCSSを追加する
WordPress 4.7以降、ユーザーはWordPressの管理エリアから直接カスタムCSSを追加できるようになりました。これはとても簡単で、ライブプレビューで変更を即座に確認することができます。
まず、WordPressのダッシュボードから外観 ” カスタマイズのページに移動します。
WordPressテーマのカスタマイザーインターフェイスが起動します。
このページでは、左側のパネルにたくさんのカスタマイザーオプションがあるサイトのライブプレビューを見ることができます。編集を開始するには、’追加CSS’タブをクリックしてください。
タブがスライドし、カスタムCSSを追加できるシンプルなボックスが表示されます。
正しいCSSルールを追加するとすぐに、サイトのライブ・プレビュー・パネルでそのルールが適用されていることを確認できます。
カスタムCSSコードの追加は、サイトの見た目に納得がいくまで続けることができます。
完成したら、一番上の「公開する」ボタンをクリックするのをお忘れなく。
注：テーマ・カスタマイザーを使って追加したカスタムCSSは、その特定のテーマでのみ使用できます。他のテーマでも使用したい場合は、同じ方法で新しいテーマにコピー＆ペーストする必要があります。
方法2：WPCodeプラグインを使ってカスタムCSSを追加する
最初の方法では、現在有効なテーマのカスタムCSSしか保存できません。テーマを変更した場合は、カスタムCSSを新しいテーマにコピー＆ペーストする必要があります。
どのWordPressテーマを使っていてもカスタムCSSを適用させたい場合は、この方法が適している。
WPCodeは、200万人以上のユーザーを持つ、市場で最高のカスタム・コード・スニペット・プラグインです。WordPressにカスタムコードを簡単に追加できる上に、ビルトインコードスニペットライブラリ、条件ロジック、コンバージョンピクセルなどの機能を備えています。
さて、最初に行う必要があるのは、無料のWPCodeプラグインをインストールして有効化することです。ヘルプが必要な場合は、WordPressプラグインのインストール方法をご覧ください。
有効化したら、WordPressの管理ダッシュボードからCode Snippets ” + Add Newにアクセスするだけです。
次に、コード・スニペット・ライブラリの「カスタムコードを追加（新規スニペット）」オプションにマウスオーバーし、「スニペットを使用」をクリックします。
次に、ページの上部にカスタムCSSスニペットのタイトルを追加します。これは、コードを識別するのに役立つものであれば何でもかまいません。
タイトルを入力した後、カスタマイザーCSSを’Code Preview’ボックスに書き込むかペーストします。次に行うことは、ドロップダウンメニューから「CSSスニペット」オプションを選択して「コードタイプ」を設定することです。
挿入」セクションまでスクロールダウンし、WordPressサイト全体でコードを実行したい場合は、「自動挿入」メソッドを選択します。
特定のページや投稿日のみコードを実行したい場合は、’ショートコード’メソッドを選択することができます。
では、ページのトップに戻ってください。
その後、スイッチを「有効化」に切り替え、「スニペットを保存」ボタンをクリックするだけです。
これで完了です！WordPressサイトにアクセスして、カスタムCSSの動作を確認できます。
方法3：フルサイトエディター（FSE）を使ってCSSを追加する。
WordPressでカスタムCSSを追加するもう一つの方法は、フルサイトエディター（FSE）を使用することです。FSEでは、ブログの投稿やページを編集するときと同じように、WordPressのブロックエディターを使ってサイト全体のレイアウトやデザインを編集することができます。
フルサイトエディターは特定のテーマでのみ利用可能です。詳しくは、WordPressのフルサイト編集に最適なテーマの投稿をご覧ください。
プラグインを使ってCSSを追加するのはもう少し簡単です。とはいえ、プラグインは使いたくないという方のために、管理メニューからカスタマイザーが利用できなくなった場合でもアクセスする方法をご紹介します。
WordPressの管理画面にログインするだけです。次に、以下のURLをコピー＆ペーストしてブラウザーに貼り付け、「example.com」をあなたのサイトのドメイン名に置き換えるだけです。
https://example.com/wp-admin/customize.php
テーマカスタマイザーの限定バージョンが表示されます。左側のメニューの一番下に、カスタムCSSを追加するオプションがあるはずです。
追加CSS」タブをクリックするだけです。
次に、Additional CSSエリアにCSSコードを入力します。
コードを追加したら、「公開する」ボタンをクリックすれば完了です。
カスタムCSSプラグインの使用とテーマへのCSSの追加
上記の方法はすべて初心者におすすめです。上級ユーザーはカスタマイザーCSSを直接テーマに追加することもできます。
しかし、親テーマにカスタムCSSスニペットを追加することはお勧めしません。カスタムの変更を保存せずに誤ってテーマを更新してしまうと、CSSの変更が失われてしまいます。
最良の方法は、代わりに子テーマを使うことだ。しかし、多くの初心者は子テーマの作成を避けています。また、初心者はカスタマイザーを追加するだけでなく、子テーマをどのように使うのか理解していないことが多い。
カスタムCSSプラグインを使用すると、テーマから独立してカスタムCSSを保存することができます。こうすることで、簡単にテーマを切り替えることができ、カスタムCSSはそのまま残ります。
WordPressサイトにカスタムCSSを追加するもう一つの素晴らしい方法は、CSS Heroプラグインを使うことです。この素晴らしいプラグインを使えば、コードを一行も書かずにWordPressサイトのほぼすべてのCSSスタイルを編集することができます。
SeedProdプラグインでカスタムCSSを追加することもできます。
SeedProdは、WordPressサイト用のカスタムWordPressテーマやランディングページを作成できるドラッグ＆ドロップ式のウェブサイトビルダーです。グローバルCSS設定を簡単に編集でき、コードは必要ありません。
WordPress サイトにカスタム CSS を追加する方法について、この記事がお役に立てれば幸いです。次に、WordPress 管理画面の壊れた CSS を修正する方法と、WordPress で CSS / JavaScript ファイルを最小化する方法についてのガイドもご覧ください。
If you liked this article, then please subscribe to our YouTube Channel for WordPress video tutorials. You can also find us on Twitter and Facebook.
Mrteesurez
Based on the method you used when adding custom CSS in a block site, I notice the site still use some element of classic customizer through the link you shared ?
I want to ask that can one just install classic widget plugin on a block theme to have easy access to the customizer for adding CSS b and other without using any custom link ?
WPBeginner Support
It would heavily depend on your specific theme. If your theme does not have the option in the customizer, we would recommend using one of the alternatives from this article.
管理者
Mrteesurez
Well, most themes have the option in the customizer, I don’t know of block theme. Thanks.
But I would recommend one to use page builder instead for full customization functionalities. Once I have learnt to use page builder, I rarely use custom CSS on pages.
Dennis Muthomi
Just to clarify – when you mention(in METHOD 1) that the CSS added via the Customizer is only available for that particular theme, does that mean the custom CSS code actually gets added to the current theme’s files?
I’m not too tech-savvy, so I want to make sure I understand correctly before diving in.
WPBeginner Comments
Rather than being added to the theme files, the Customizer stores the CSS in the database and associates it with the theme.
Mrteesurez
I don’t know of this, thanks. That means the added custom CSS is not staying in the theme files rather in the database, so, why do we need to copy and re-paste the custom CSS code while changing the theme when it’s actually resides within the database ?
WPBeginner Support
When adding the CSS code it is connected to the theme itself when you save. When you load a new theme it would load any CSS connected to that theme.
Qasim Saeed
Hello if I want to add a custom CSS on a specific page without any plugin then what? I think we add this via function? can you please tell me how to add CSS via functions.php and what is the best and secure way to add CSS for a specific page
WPBeginner Support
You do not need to use functions to add CSS to specific pages, you would target the specific page in your CSS selector to have it only affect a single page on your site.
管理者
Jiří Vaněk
Is it better to insert your own CSS in WordPress using a template or using WPCode?
WPBeginner Support
Both options are valid choices it depends on personal preference and if the theme has the option in the editor.
管理者
Jiří Vaněk
Thanks for the clarification, I wasn’t sure if, for example, a snippet using WPCode would be faster for the site’s response than integrating it into the template itself. So if it doesn’t matter, I’ll probably stick to best practice and keep it integrated in the template.
Bavi
The adding of css is no longer available for free plan any alternatives??
WPBeginner Support
Our tutorials are for WordPress.org sites, we do not have specifics for WordPress.com at the moment. We would recommend taking a look at our guide below for the comparison between the two and if you wanted to look to transfer your site from WordPress.com to a self hosted WordPress.org site.
https://www.wpbeginner.com/beginners-guide/self-hosted-wordpress-org-vs-free-wordpress-com-infograph/
管理者
Ben
I never knew about the example.com/wp-admin/customize.php “trick”. Thanks! Worked like a charm!
WPBeginner Support
Glad we could share this trick with you!
管理者
Dani
Hi there,
I want to add custom CSS, but how can i remove it if smth goes wrong?
Bogdan
Hey, this article is very good. One question though: Don’t I have to see the HTML page to add custom CSS? How do I add custom CSS if I don’t know the selectors and all of that?
WPBeginner Support
We have a guide on using Inspect element that you can take a look at below for how to find the selectors:
https://www.wpbeginner.com/wp-tutorials/basics-of-inspect-element-with-your-wordpress-site/
管理者
cymon
I am a new blogger. Is there a way to add page specific CSS code?
WPBeginner Support
You would need to add the page ID as part of the CSS but yes you can.
管理者
Jitin Mishra
Great article to add custom CSS in WordPress website. We are looking forward to such more informative posts
WPBeginner Support
Glad you found our guide helpful
管理者
Mohsin
I want to change my WordPress menu to mega menu with coding. Can i convert my website menu to mega menu using html, css and js? I don’t want to use a plugin for this work. If we add new functionality to WordPress website with custom coding, what are the best practices for which this custom work did not go ahead by updating theme or WordPress. Thanks!
WPBeginner Support
You would want to create a child theme to keep your changes safe but you may need some PHP coding. We have a guide on creating a child theme you can take a look at below:
https://www.wpbeginner.com/wp-themes/how-to-create-a-wordpress-child-theme-video/
管理者
vijay v
can we add external CSS file( by moving custom CSS) to increase page speed( after I added custom CSS it decreased loading speed), if yes how to do it?
thank you in advance
WPBeginner Support
If we are understanding what you are looking for correctly, you would want to take a look at our article below:
https://www.wpbeginner.com/wp-tutorials/how-wordpress-plugins-affect-your-sites-load-time/
管理者
billy king
Is “unorthodox” CSS allowed in Child Theme or Custom CSS?
WPBeginner Support
As long as the CSS targets what is on your site you can use any CSS you like.
管理者
Latonya Moore
This is great but is there a way to only add css to one page? Example I only was to show or hide by hover or mouseover on one text.
WPBeginner Support
You would either need to add a CSS class to the specific object or add the page ID to your CSS to limit it to that specific page. For how to find that information you would want to take a look at our article below on how to use inspect element:
https://www.wpbeginner.com/wp-tutorials/basics-of-inspect-element-with-your-wordpress-site/
管理者
shiva
I have made some Changes in my website by editing some css codes in theme editor. What will happen if I update my wordpress to next version. Does it get error or gets back to base theme or my code will appear even after updating my wordpress just like before updation.
WPBeginner Support
If you added your CSS in the Appearance>Customizer>Additional CSS area then your CSS changes will remain when you update your site.
管理者
Jo
I have not quite finished building my website, but have updated from the free version so I can use css to make changes. My site is not yet live. With the upgrade to the premium version the update button has now changed to publish. Does this mean that when I click on publish to save any changes it will make my site live?
Also, I can’t remember which theme I used, how do I find out which theme I am using?
Thanks
WPBeginner Support
It sounds like you are on WordPress.com, if you publish a post then it will be viewable to those who can see your site. With WordPress.com for a private site you are limited to: https://en.support.wordpress.com/settings/privacy-settings
You should be able to see the theme that is active under Appearance>Themes
管理者
Bruce William Taylor
“The tab will slide to show you a simple box where you can add your custom CSS. As soon as you add a valid CSS rule, you will be able to see it applied on your website’s live preview pane.”
I already know WHERE to add the CSS. How do I know what CSS to add? How do I know what the “valid CSS rules” are?
WPBeginner Support
Hey Bruce,
For that you will need to learn some basic CSS. There are several websites that have step by step CSS tutorials for beginners. We recommend w3schools as they allow you to practice CSS with a live try it out box.
管理者
Ali
Where is the Customize CSS Code storage because I have lost it while a transfer to a new hoster?
mahaveer
i want to add external css and add images in css…..
Muhammad Adil
What was the Bonus method?
Is that any Plugin I didn’t get that. Will you please ask me ?
Thanks
Aditya Khuteta
Hi there! I want to change the size of price text on my website becuase the price text is too small there. Please guide me to do so.
Thanks
Frank Lurz
2 Questions:
1. Just so I’m clear, “plugins” are substitutes for writing CSS, a difficult task for those of us who know nothing about CSS — is that right?
2. Plugins listed for downloading on the WP plugins page are available for installation only to subscribers who have paid for the “Buisness” Plan, is that right?
WPBeginner Support
Hi Frank,
1. No, plugins are not substitute for writing custom CSS. You can write custom CSS without installing plugins. Please see our guide on what are WordPress plugins and how do they work for more details.
2. IF you are using WordPress.com, then yes you will need to upgrade to business plan. Please see our guide on the difference between self hosted WordPress.org vs free WordPress.com blog.
管理者
Annie Mitchell
Hi,
I am a novice when it comes to building and designing websites and have no knowledge of css. I am using the Sydney theme on my website – and I have somehow managed to turn my paragraph font white. I have googled and notice a gentleman had the same issue. He fixed it downloading a plugin and using a custom css however I have tried and had no luck.
The css which he advised using is –
.entry-page p, .entry-post p {
color: black !important;
margin: 0 !important;
padding: 0 !important;
}
but I am not sure why it is not working for me. Any help would be much appreciated.
Thanks,
Annie
WPBeginner Support
Hi Annie,
First we will recommend you to turn off all your WordPress plugins by deactivating them. After that, visit your website to see if this resolved your issue. If it did, then this means a setting in one of your plugins was causing the problem. If it doesn’t solve the issue, then try switching to a default theme like Twenty Seventeen. If that does fix your issue, then it means that some where in your theme you have changed the font settings.
If nothing works out, then you can try this custom CSS:
p { color:#000; }1-click Use in WordPress
管理者
Jose
One of the plugins (Simple Custom CSS) hasn’t been updated for 2 years which in the world of Wordpress plugins is a very long time. This is a security risk so I would personally look for an alternative.
Rebecca
Hi
Sorry i don’t know anything about css and I am trying to solve a problem with not being able to search for plugins, but that is another story! I am posting here now because i am getting this message when i go to appearance / edit css / aditional css
” There is 1 error which must be fixed before you can save.
Update anyway, even though it might break your site?”
Is this something i shoudl worry about?
the text in the box below it reads …
and just here there is a red fullstop
Hope someone can help.
Thank you
WPBeginner Support
Hi Rebecca,
You can copy the CSS and paste it in a text file and save it as backup. Now delete every thing in Additional CSS box and start adding your custom CSS one rule at a time until the error appears again. This will help you locate the error and fix it.
管理者
James
This no longer works for free accounts. The CSS option is no longer there and you need a business account to install a relevant plugin.
WPBeginner Support
Hi James,
You are probably using WordPress.com. Please see our guide on the difference between self hosted WordPress.org vs free WordPress.com blog.
管理者
scott
Before WP version 4.9, I used to be able to cut and paste my custom CSS (from the WP customizer) and paste it into Windows Notepad (and it would keep the formatting. I did this often to save it as a back up when I was adding new custom CSS — in case I made a mistake.
Now when pasting it in Notepad, it just runs all the CSS together without the line-by-line formatting in Notepad.
Any idea why or how I can fix it? I already have “word wrap” mode set in Notepad.
Thanks.
WPBeginner Support
Hi Scott,
You can try saving the code in other text editors like Notepad++. If the problem persists, then try WordPress troubleshooting tips.
管理者
Joe MacMillan
This site is really good. My site didn’t have any link colors so I used this code /* unvisited link blue */
a:link {
Color: #196380;
}
/* visited link green */
a:visited {
color: #248f24;
}
/* mouse over link orange */
a:hover {
color: #ff3300;
}
/* selected link red*/
a:active {
color: #cc0000;
}
but it turned colors on for everything that is a link such as menu’s into a color.
I only want the colors for linking.
I would appreciate any help with this. Thanks
WPBeginner Support
Hi Joe,
In your CSS, you didn’t define which areas should have links in these colors, which makes them apply to entire body. To figure out which areas you need to target, you will need to use the Inspect Tool to find out the CSS class used by your theme for the content block.
Let’s suppose the content block in your theme has a css class site-content, you will use it in your CSS like this:
.site-content a:link { color: #196380; } .site-content a:visited { color: #248f24; } .site-content a:active { color: #cc0000; } .site-content a:hover { color: #ff3300; }1-click Use in WordPress
Hope this helps
管理者
Rob
I love your site!
Thanks for all the helpful articles.
I have a question regarding my wordpress premium plan.
I want to add the following script to my site.
var refTagger = {
settings: {
bibleVersion: “NKJV”
}
Can I add this to the custom css?
I don’t have the ability to access the header or footer in this plan
Thanks,
Rob
WPBeginner Support
Hi Rob,
Nope, you cannot. Please see our guide on the difference between self hosted WordPress.org vs free WordPress.com blog.
管理者
sammy
this is really a great article, i will have to start learning how to make my own css for my site
Thomas
Hello,
this feature isn’t active for the site admin on a multisite WordPress network.
Do you think that activating it for site admin (with this plugin for example:) would create a security issue?
Thank you!
WPBeginner Support
Hey Thomas,
Yes you can use a plugin to add custom CSS.
管理者
Thomas
Hi,
yes I know (I have already used the very good Simple Custom CSS plugin), but I would prefer to use the native function since it is implemented in Wordpress.
However, this function is only available for the network admin and not for the site admin on a multisite installation.
The rights can be easily changed to allow site admin to add their own custom CSS in the customizer (with the native WP function) (see this plugin: http://www.wordpress.org/plugins/multisite-custom-css/), and I wonder if this would create a security issue (based on the assumption that I can’t trust site admin)?
WPBeginner Support
Hey Thomas,
Sorry, we totally misunderstood your question
We agree that will be a concern, this is why the feature is turned off. If you turn it on, then the users will be able to add unfiltered CSS. You should keep it switched off.
Brice
I don’t know much about code so I’m just wondering if I make changes and click “save and publish”, is there a way to get the original code back if I don’t like the changes or do I need to copy and save the original code in the event I want to restore it?
Ruth Billheimer
This is probably really naive, I don’t know much about code, so bear with me.. In the customise additional css, can you put in different things? I mean I have already put something in there that will change some of the colours. Now I want to put in something that will change the width of the page. (I am getting these bits of code from very helpful people, I know nothing!)
So will both of these things work? Or can you only change one thing? It doesn’t look like the page width has changed
Jos Schuurmans
Hi there,
It used to be possible to edit style.css from within WP admin, under the Appearance menu.
On WP multisite it was through the network’s themes submenu. Has that feature been depricated?
Cheers,
Jos
Judy
Great post, thanks!
Can anybody help me with this? I did a small customization on my logo using CSS Hero. Then I’ve copied these exact 9 strings of code into my Simple Custom CSS plugin, after deactivating CSS Hero. I thought I could reproduce the same CSS Hero customization on my logo using Simple Custom CSS, but instead it’s not working.
I refreshed the page and cleared the cache, but the customization still doesn’t take effect. Why’s that?
Thanks,
Judy
Robin
This is all that is on my CSS Style Sheet.
/*
Welcome to custom CSS
To learn how this works, see
*/
Do I erase his and add my new font code? Help????
WPBeginner Support
Yes. These are just comments to help new users get started.
管理者
Paul H.
OUTSTANDING PLUGIN!!!
I spent much time trying to get the built in WP Editor to “style” my custom page, with no luck…
I searched for a plugin to see if there was one and found yours… within minutes I’d installed your plugin and activated it, then input my CSS, clicked update and then refreshed my custom page… it’s perfect!
A+++
Ian
Hi Guys,
I’ve installed the Simple custom CSS plugin & activated it. I have a table created on one of my webpages that I wanted to have a border around it.
As a result, I have added the following code to my simple custom CSS plugin
table {
border: 2px solid black;
}
and updated the Custom CSS but nothing happened – I still don’t get any border on my webpage table.
Any suggestions?
Regards
Ian
Molly Setzer
Hey Ian,
It’s likely that you are not calling it by the correct css selector. Use the most defined selector to grab the element. For example, if your table has a class of “info” then calling it by the more specific table.info will help you reach the element. Check if it has more selectors in the html.
ramneet
Thanks for sharing. it just wonderful way of learning WordPress i like it.
Estee Peter
How do i add custom css via my existing specific website plugin
this is the following code
.mobileonly {
display: none;
}
@media screen and (max-width: 480px) {
.mobileonly {
display: inline;
}
}
.hidemobileonly {
display: inline;
}
@media screen and (max-width: 480px) {
.hidemobileonly {
display: none;
}
}
Gary Zielke
Does the Custom CSS plugin work on individual pages.
i.e can I add style to a single page and not the whole theme?
Thanks
WPBeginner Support
No it doesn’t work on individual pages.
管理者
Tori Tran
thank you ^^
Russell Bruce
Would it not be useful to explain what CSS does and why it is useful
Joey
Thanks, I wish I realized this sooner because I’ve made all my css changes on the style.css file since I’m making the changes locally but are you saying that if for some reason Genesis decides to update the particular child theme I used I will lose those changes? I don’t know if I’ve ever seen them update their child themes although I’ve only been using Genesis for a few months so I suppose it is entirely possible they will update certain ones here and there. I think going forward I’ll make my changes in the plugin especially if the site is live.
suzie
Use the theme you like and create a ‘child theme’
The child theme is then unique to your website.
Make any changes only on your child theme.
The theme designer may update their theme, but your changes will remain. (Depending on the designers update you may need to tweak your changes, but that’s unlikely).
Rodney
Great article.
I just wanted to add here. There’s a lot of option here specially sites running in WordPress, building/creating custom css is simple. Most wordpress themes usally support adding custom css without having to create or add additional plugins.
I also agree, and the best option here is using a child theme instead.
thanks