How To Add Custom Editor Styles to Gutenberg

Adding Custom Gutenberg editor styles in WordPress is a nice touch to any theme, as it allows authors to get a basic preview of their content before it gets published. It seems like a complicated task, but it’s actually pretty simple, once you get started.

Before

After

The PHP

It begins with registering and enqueueing a CSS file in your theme.

	<?php
	/**
	* Enqueue the Gutenberg editor stylesheet.
	*
	* Put this in your functions.php.
	*
	* @action enqueue_block_editor_assets
	*/
	function jr3_enqueue_gutenberg() {
	// Make sure you link this to your actual file.
	wp_register_style( 'jr3-gutenberg', get_stylesheet_directory_uri() . '/css/editor.css' );
	wp_enqueue_style( 'jr3-gutenberg' );
	// This font is enqueued for the demo only. You probably won't need this.
	wp_register_style( 'jr3-webfonts', 'https://fonts.googleapis.com/css?family=Montserrat&#39; );
	wp_enqueue_style( 'jr3-webfonts' );
	}
	add_action( 'enqueue_block_editor_assets', 'jr3_enqueue_gutenberg' );

view raw gutenberg-custom-editor-styles.php hosted with ❤ by GitHub

The CSS

The CSS is a bit trickier because there are so many blocks and elements to cover. Here is an example that I’ve put together for this demo that can be a starting place for you.

	/* Custom Editor Styles */
	/*
	* With some edits, this can be used as a base for your Custom Editor Styles.
	* Note that this is for demonstration purposes only, and some elements may not
	* be covered here.
	*/
	/* Approximate the theme width, except for full-width images. */
	.wp-block:not( '.editor-block-list__block["data=full"]' ) {
	width: 95%;
	max-width: 1000px;
	}
	/* Fonts */
	/* Note that Montserrat is enqueued in the PHP function that enqueues this file */
	.editor-writing-flow .wp-block textarea,
	.editor-writing-flow .wp-block .wp-block-freeform,
	.editor-rich-text p,
	.editor-post-title__input,
	.wp-block-quote__citation {
	font-family: 'Montserrat', Arial, Helvetica, sans-serif;
	}
	/* TinyMCE Editor */
	.editor-styles-wrapper p,
	.editor-rich-text p,
	.editor-styles-wrapper blockquote {
	font-size: 16px;
	line-height: 22px !important;
	}
	.editor-writing-flow .wp-block a {
	color: #00a2ad !important;
	}
	/* Headings */
	.editor-writing-flow .wp-block h1,
	.editor-writing-flow .wp-block h3,
	.editor-writing-flow .wp-block h3{
	font-weight: bold;
	}
	.editor-writing-flow .wp-block h1 {
	font-size: 36px;
	line-height: 1.5em;
	}
	.editor-writing-flow .wp-block h2 {
	font-size: 25px;
	line-height: 1.5em;
	}
	.editor-writing-flow .wp-block h3 {
	font-size: 16px;
	line-height: 1.5em;
	}
	/* The Post Title */
	.editor-post-title__block .editor-post-title__input {
	color: #00a2ad;
	text-align: center;
	}
	/* Blockquote styles */
	.wp-block blockquote {
	font-style: italic;
	color: #aaa;
	margin-left: 20px;
	border-left: 0;
	padding-left: 0;
	}
	.wp-block blockquote .editor-rich-text {
	padding-left: 3rem;
	}
	.wp-block blockquote:before {
	color: #ccc;
	content: '\201C' !important;
	font-size: 4em;
	position: absolute;
	top: 10px;
	}
	.wp-block-quote:not(.is-large):not(.is-style-large) {
	border-left: 0;
	margin-left: 0;
	padding-left: 0;
	}

view raw gutenberg-custom-editor-styles.css hosted with ❤ by GitHub