How to Repair Broken CSS in WordPress Admin Panel

come across WordPress The problem of corrupt backend CSS styles is a real headache. This is because the backend admin interface may turn out to be a messy, unstyled page.

This problem not only makes the backend of the website difficult to use, but also directly hinders the management and maintenance of the website, so it is a problem that needs to be solved as soon as possible. And many newbies often don't know how to fix it.

We have encountered a similar problem on our own website, so we tried all the troubleshooting steps to find out the easiest and most effective solution. In this tutorial, we will share how toQuick Fix WordPress Backend CSS style corruption issue.

Why is the WordPress backend CSS broken?

There are many reasons for WordPress backend CSS corruption, which makes it difficult for newbies to troubleshoot the problem. Below is our summary of the main causes of broken CSS styles in the WordPress backend:

1. plug-in conflict
   Some plugins with poor code quality may come with their own CSS files, which can conflict with the WordPress default styles and cause backend styling anomalies.
2. HTTP/HTTPS mismatch
   When a site has mixed content issues (some files are loaded over HTTP instead of HTTPS), the browser may prevent the CSS file from being loaded, resulting in a loss of style.
3. Thematic interference
   Some themes load their own CSS files in the backend, which can cause conflicts. This may also cause styling issues if a custom backend theme is used.
4. Caching issues
   The browser cache may be storing outdated CSS files. Also, the caching plugin may be serving up old CSS files, causing styles to be displayed incorrectly.
5. CDN Issues
   A misconfigured content delivery network (CDN) may serve up older versions of CSS files, resulting in missing or corrupted styles.
6. File permission error
   If the permissions on CSS files are not set correctly, the server may not be able to read them.
7. file corruption
   CSS files may be damaged or lost during the update or upload process.
8. Browser extensions
   Some browser extensions, especially content blockers, may interfere with the display of CSS.

Understanding these causes can help to quickly pinpoint the root cause of broken CSS styles in the WordPress backend, so you can fix the problem more effectively.

Step 1: Check for Plugin Conflicts

In our experience.WordPress Plugin(especially poor quality plugins) are usually the main cause of CSS corruption in the backend. However, sometimes even well-written plugins can cause conflicts due to WordPress site or server configuration issues.

Here's how to recognize and resolve plugin conflicts:

1. Disable all plug-ins

First, go to the WordPress backend and navigate to the Plugins " Installed Plugins Page.
Check all plug-ins in the batch operation Select from the drop-down menu deactivateand then click applianceThe

After that, refresh your backend page or reload it to see if the CSS issue is resolved. If the issue is resolved, it means that a plugin is causing the conflict.

2. Enabling plug-ins on a case-by-case basis

In order to identify the specific plugins that are causing the problem, you need to re-enable the plugins one by one. Under each plugin click the start usingThe

Then refresh the backend page and check if the CSS is broken again.
In this way, it is possible to locate the specific plug-in that is triggering the problem.

3. Updating or replacing plug-ins

Once a conflicting plugin has been identified, you can check if there is an update available for that plugin. If an update does not resolve the issue, consider finding a replacement plugin or contacting the plugin developer to resolve the issue.

Step 2: Checking HTTPS Loads for Unsecure Files

Another common issue that leads to CSS corruption is improper HTTPS configuration, which can lead to mixed content issues.

This happens when a website uses the HTTPS protocol, but some CSS files are still loaded over HTTP (an insecure protocol).
When this happens, browsers like Google Chrome automatically block these unsafe resources, resulting in corrupted WordPress backend CSS.

How do I identify the problem?

This can be done by using the browser's Inspection tools (Inspect) Confirmation of the issue:

1. Open your browser, right-click on the page and select probeThe

2. Switch to Console tab to see if the Mixed Content errorThe

If something like "Insecure content blocked" error message, indicating that the problem does exist.

How do I fix mixed content issues?

1. Checking URLs in WordPress settings

• go into Settings " General page to ensure that the WordPress Address respond in singing site address The URLs in the HTTPS Beginning.

2. Force WordPress to use HTTPS If the URL is already correct, you can manually force WordPress to use the HTTPS protocol.
Edit your wp-config.php file and add the following code:

define('FORCE_SSL_ADMIN', true);
if (strpos($_SERVER['HTTP_X_FORWARDED_PROTO'], 'https') ! == false) {
    $_SERVER['HTTPS'] = 'on';
}

Use plug-ins to solve If you are not familiar with the code, you can use plugins such as Really Simple SSLThe first step is to force all URLs to use HTTPS with a single click.

Step 3: Check for Thematic Interference

Theme interference is one of the common causes of CSS corruption in the WordPress backend. Here are ways to recognize and fix theme related issues:

1. Switch to the default theme

To confirm if a WordPress theme is causing CSS corruption, you first need to switch to the default WordPress theme.

1. Go to the WordPress backend and navigate to Appearance " Themes Page.
2. Activate a default WordPress theme, for example Twenty Twenty-FourThe

take note of: If you don't have the default theme installed, you can click on the top of the Add New Topic button to search for the default theme and install it. The default theme is usually named after the year.

3. After switching themes, refresh the backend page to see if the CSS issue has been resolved.

If the problem is resolved, it means that your original theme is causing a CSS conflict.

2. Fix theme conflicts

If you confirm that the problem is coming from the theme, you can try the following:

Check for theme updates

• go into Appearance " Themes page, select your theme and click Immediate Updates button to ensure that the latest version is used.

Check Theme Customization Code

• If the update doesn't work, you need to check for custom modifications in the theme, specifically:
  • Additional CSS(Styles added in theme customization settings).
  • functions.php file in the custom code to see if there are any errors.

Contact the theme developer

• If the issue is still not resolved, you can contact the theme developer for technical support.
• If the problem can't be fixed, consider switching to another thread.

3. Managing customized code with WPCode

To avoid similar problems in the future, it is recommended to use WPCode Plugin to manage custom code. It is a powerful WordPress snippet management plugin that supports managing custom CSS without having to directly modify the functions.php Documentation.

Advantages of WPCode:

• Save and manage custom CSS code more easily.
• Built-in error checking to help identify problems.
• No custom CSS is lost when switching themes.
• A free version is available, suitable for basic needs.

Our site also uses WPCode to manage custom code snippets, including custom CSS.

Step 4: Fixing Caching Issues

Normally, WordPress caching plugins do not cache the backend admin area. However, incorrect cache settings can conflict with the browser cache, which can lead to CSS corruption issues.

1. Clear the browser cache

First, you need to clear your browser cache:

• Open Settings in your browser and find Clear Browsing Data Options.
• Select Clear cached data and make sure the option to cache files is checked.
• Once the removal is complete, reload the WordPress backend to see if the issue has been resolved.

2. Clear WordPress Cache

If the problem persists, the next step is to clear the WordPress cache.

• This is a cache file generated by the WordPress Cache plugin.
• Go to the settings page of the cache plugin and find the clear the cache or similar options.

For more details on how to do this, see our articleHow do I clear the cache in WordPress?

Step 5: Fix CDN Issues

If the site uses a Content Delivery Network (CDN) service, a misconfiguration may result in corrupted CSS in the WordPress backend. Here's how to recognize and fix these issues:

1. Recognizing CDN errors

Use your browser's Inspection tools (Inspect)Switch to Console Tab. If the CSS file is blocked or not found, you will see the relevant error message here.

2. Clearing the CDN Cache

1. Log in to your CDN service's website, such as Cloudflare, and go to the control panel.
2. leave for Caching" Configuration Part.
3. strike (on the keyboard) Purge Everything button to clear all CDN caches.

take note of: The interface may vary slightly from one CDN service provider to another, but the option to clear the cache is usually easy to find.

After clearing the cache, go back to your site and reload the backend page to see if the CSS issue has been resolved.

Step 6: Fix File Permission Errors

Incorrectly set file permissions may prevent the server from reading the CSS files, which can cause WordPress backend CSS corruption issues. Here's how to check and fix file permissions:

1. Connecting to the website

Connect to the WordPress site using the FTP utility. Once connected, navigate to the WordPress root directory containing the wp-admin,wp-includes respond in singing wp-content Folder.

2. Check and change folder permissions

1. Right click wp-admin folder, select file permissions maybe causalityThe

2. Make sure the permissions of all directories are set to 755The

• If the permissions are incorrect, change them to 755 and choose to apply them recursively to all subdirectories.

3. Check and change file permissions

1. Repeat the above steps to set the file permissions to 644The
2. Ensure that permissions are applied recursively to all files (files only).

After completing the above steps, revisit the WordPress backend page to see if the CSS issue has been resolved.

Step 7: Repair damaged files

Corrupt files can also cause WordPress backend CSS to display abnormally.

WordPress files can be corrupted due to the following reasons:

• WordPress updates are incomplete
• Accidental deletion of documents
• Hosting Service Provider Misconfiguration

Methods of repairing or replacing corrupted files

1.Download WordPress Latest Version

• (after a verb of motion indicates movement away from the speaker) WordPress.org and download the latest version of the WordPress file.
• Extract the downloaded ZIP file to your computer.

2. Link to website

• Connect to the WordPress site using an FTP utility or control panel.

3. Upload the latest WordPress file

• Upload the WordPress files from your computer to the root directory of your website.
• Select when uploading Overwriteto ensure that the new file replaces the old one. Once the upload is complete, visit the WordPress backend page to check if the CSS issue has been resolved.

Step 8: Check for Browser Extensions

Browser extensions (especially those related to content blocking and adblocking) may interfere with the display of the WordPress backend CSS.

How to Identify and Resolve Problems Caused by Extensions

1. Open the Extension Management Menu

• Navigate in your browser to Extension/plugin management Menu.

2. Temporarily disable all extensions

• Especially ad blockers and security plugins.
• You can choose Disable extensions Or just turn it removingThe

3. Check if the problem is solved

• After disabling the extension, visit the WordPress backend to see if the CSS issue has been resolved.

4. Enabling extensions on a case-by-case basis

• If the problem is resolved, it means that an extension is causing the conflict.
• Re-enable the extensions one by one, refreshing the backend page after each one to confirm if the problem occurs again.

5. Adjust extension settings or find a replacement

• Once you've found the problematic extension, check its settings to make sure it's not blocking CSS in the WordPress backend.
• If the settings don't work, consider looking for other alternative extensions.

Hopefully these will help you guys out!