Simple Guide to Custom CSS in WordPress

Using the WordPress Customizer for CSS

Adding Custom CSS Using the WordPress Customizer

Custom CSS lets you change how your website looks without diving into the theme's core files. For WordPress users, there's a handy way to add these styles directly from your dashboard using the WordPress Customizer. Let's explore how to do this step-by-step.

Step 1: Access the Customizer

Navigate to your WordPress dashboard. Look for the 'Appearance' menu on the left-hand side. Click on 'Customize' to open the WordPress Customizer. This tool allows you to tweak various aspects of your site's appearance directly.

Step 2: Locate the 'Additional CSS' Section

With the Customizer open, you will see several options on the left side. Scroll down until you find the 'Additional CSS' tab, and select it. This area is specifically designed for you to input custom CSS codes.

Step 3: Add Your Custom CSS

In the 'Additional CSS' section, you'll find a text box. Here, you can write or paste your custom CSS code. As you type, the live preview of your site on the right will update in real-time, showing how the changes affect the look of your website.

For example, to change the background color of your site's header, you might add:

.site-header {
    background-color: #a4a4a4;

Replace #a4a4a4 with any color code you desire.

Step 4: Publishing Your Changes

Once you're satisfied with the adjustments you've made, click the 'Publish' button to apply the custom CSS to your live site. It's that simple! Your custom styles will now be visible to all your site visitors.

Using the WordPress Customizer to add custom CSS is efficient because it does not require editing your theme's core files. This method allows for personalization of your WordPress site's appearance while being ideal for performance and ease of use.

Leveraging WPCode for Advanced CSS Customizations

Choosing WPCode for Adding Custom CSS Across Multiple Themes

When managing a WordPress website, the ability to personalize your site's appearance is crucial. Sometimes, the theme customizer's offerings aren't sufficient, and you need more – that's where custom CSS comes into play. However, if you're switching themes or managing multiple sites, maintaining these customizations can become cumbersome. WPCode emerges as a solution for handling custom CSS across various themes efficiently.

WPCode simplifies the process of injecting your custom CSS into your WordPress site, providing a solution that withstands theme changes. This flexibility is crucial for web managers and developers who frequently update their site's appearance or switch themes. By adopting WPCode, you safeguard your customizations, ensuring a consistent look and feel across your site, regardless of theme alterations.

Setting up this tool involves a straightforward series of steps:

  1. Install and activate the WPCode plugin from your WordPress dashboard.
  2. Head over to Code Snippets, then tap on + Add New to start creating your custom CSS.
  3. With a dedicated user interface, WPCode provides a space to title your snippet and input your CSS code.
  4. Control where your code is applied, be it site-wide or within specific sections, providing customization options.

WPCode's universal application is a key benefit. Unlike the method limited to the theme customizer, changes made through WPCode stay with your site, unaffected by theme changes. This durability means that your effort in perfecting your site's look remains intact, even as you explore new theme options.

Another feature of WPCode is its "Auto-Insert" function, simplifying the application process of your CSS. Once you've created your code, choosing 'Auto-Insert' creates a connection between your custom CSS and your WordPress site. WPCode handles the embedding of your code universally, making theme transitions easier.

In summary, selecting WPCode for managing your custom CSS across multiple themes offers simplicity, versatility, and robustness. Its ability to work beyond theme limitations ensures your site's aesthetic is maintained, granting you the freedom to fully express your brand's personality. With WPCode, you can fine-tune your site's design, confident that your visual style remains consistent, theme after theme.

The WPCode plugin interface showing where to add custom CSS code

Understanding Full Site Editor (FSE) for CSS Changes

Revolutionizing Custom CSS with Full Site Editing in WordPress

Building upon the essentials of customizing your WordPress site's aesthetics with CSS through the WordPress Customizer and utilizing WPCode, the integration of the Full Site Editor (FSE) into this process offers a new approach to website design simplicity and control. The FSE simplifies customization, making it accessible to users at any skill level. Let's explore how FSE enhances your creative journey in WordPress.

The Full Site Editing feature, introduced with WordPress 5.9, changes how you can deploy and manage custom CSS across your site.1 Unlike traditional methods constrained by themes or custom plugins, FSE offers an approach that combines the simplicity of block editing with comprehensive control.

FSE, which primarily operates with compatible themes, extends the block editor's functionality to your entire site, including headers, footers, and sidebars, areas previously inaccessible without adequate coding knowledge or the assistance of a theme's customizer.2 Here's how FSE is transforming CSS customization:

  1. Unified Design Experience: FSE enables a seamless design experience across your website. By using the Global Styles interface, you can easily apply custom CSS universally or to specific blocks without using multiple tools or editors. This unified approach ensures consistency and saves time.
  2. Direct Visual Feedback: With FSE, you're editing your site live, providing instant visual feedback. This immediacy allows for a more intuitive design process, as changes in CSS are reflected in real-time, providing a clearer understanding of how modifications affect the overall appearance.
  3. Eliminating Theme Constraints: FSE reduces the limitations set by themes on customization. Through its block-based approach, users gain the flexibility to implement creative ideas without being restricted by the theme's inherent design. This freedom enhances creativity and personalization.
  4. Enhanced Accessibility: By bringing customization options directly into the user interface, FSE makes site-wide design changes more accessible. Users with minimal exposure to coding can now make precise tweaks through a graphical interface.
  5. Simplified Management for Multi-Theme Sites: For those running multiple themes across different WordPress installations, managing custom CSS through FSE's centralized approach simplifies operations. It provides a consistent method to apply and manage CSS, regardless of the active theme.

Customizing with Full Site Editing enhances site uniformity and design coherence while redefining the experience of personalizing your WordPress site. By combining direct manipulation of site elements with the scope of CSS, FSE empowers you to invigorate your web presence with creativity and precision, setting a new standard for what you can achieve on your own.

Whether you're tweaking a small detail or overhauling your site's entire appearance, FSE's integrated approach to CSS customization amplifies your creative power in WordPress, making it a key tool for personalization in this new era of website design.

A person using the Full Site Editing feature in WordPress to customize their website with blocks and CSS


  1. Full Site Editing. Accessed June 14, 2023.
  2. Blocks. Accessed June 14, 2023.

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Toby Cryns

Toby Cryns is a freelance CTO and WordPress Guru. He also writes for