How to Hire a WordPress Developer for Theme Customization and CSS Fixes

The menu wraps onto two lines on phones, and the theme settings won’t let you fix it. You pasted a CSS snippet from a forum, but nothing changed, or something else moved.

Small design problems make a site look unfinished, and edits in the wrong place disappear with the next theme update.

Here’s what to try yourself in ten minutes, and if that doesn’t do it, how to hire a WordPress developer for theme customization so the change stays put after updates.

Why your WordPress theme change won’t stick

Most theme changes fail for one of three reasons: the change went into the wrong place, a cache shows you the old version, or the theme’s own CSS is stronger than yours.

Where you save a design change decides what happens after an update or a theme switch:

• Theme settings The options in the Customizer or the Site Editor. Safest, but limited to what the theme author added.
• Additional CSS A box for your own CSS. It’s saved in the database, so theme updates keep it, but it belongs to the active theme and doesn’t follow you if you switch themes.
• Theme files The theme’s own CSS and PHP files. A theme update replaces them, so any edit there disappears.
• A child theme A small theme that loads the main theme and holds your changes in its own files. Updates to the main theme leave it alone, as the WordPress child theme handbook explains.

When I take over a site, I first check for direct edits to theme files. That’s the most common reason “the design broke after an update”. Your content is fine in every one of these cases. Only the look changed. If a theme edit took the whole site down, see how to hire someone to fix a broken WordPress site.

Try this first (10 minutes)

Most small CSS problems are caching or placement. These checks are safe and don’t change your design:

1. Clear the cache. Use the “clear cache” button of your caching plugin or hosting panel, then reload the page in a private window and on your phone. A change that shows only after that was cached, not broken.
2. Look in the theme settings first. Colors, fonts, header layout and button styles are often already options in Appearance → Customize or, for block themes, in the Site Editor under Styles.
3. Find where the old CSS lives. In a classic theme it’s Appearance → Customize → Additional CSS. In a block theme, open the Site Editor’s Styles panel and look for Additional CSS. If a snippet there has a typo or a missing bracket, the rules after it can stop working.
4. Copy what’s there before you change it. Paste the current CSS into a text file. That’s your undo button.

Skip the DIY and hire straight away if the change touches the header, the checkout or templates, or if your theme has an update waiting and someone edited its files before.

If the ten-minute checks didn’t solve it, or the change needs more than a few lines of CSS, stop here and hire a developer. Guessing which elements a CSS rule targets can break the checkout or mobile menu.

Where to hire a developer

I recommend Fiverr for theme customization and CSS fixes. I work there myself, so I know how orders, payments and reviews work from the inside. A small, clearly defined change suits a fixed-price order.

What it costs

At the time of writing, these are the typical Fiverr prices:

Package prices don’t include Fiverr’s service fee, which is added at checkout.

What the cheap price usually skips

A $10 fix is fine for one color on one page. For anything bigger, check whether the package includes:

• a child theme or Additional CSS instead of edits to the theme files
• a check on phones and tablets, not only desktop
• a check on the other pages that share the same element
• a note of what was changed and where
• a staging copy for changes to templates or the header

A fix made in the theme files can vanish at the next update, leaving you paying for it twice.

How to choose the right developer

For a small CSS fix, where the change ends up matters more than the price. Look for someone who asks about that.

Check reviews for small fixes

Look for reviews that mention CSS, theme changes or your theme by name: Astra, Kadence, GeneratePress, Divi. Read the one- to three-star reviews and the seller’s replies.

Watch how they answer your message

A good seller asks which theme you use, whether you have a child theme and which pages share the element. A copy-paste promise of “any change in one hour” tells you little.

The questions I’d ask before ordering

• Where will the change go: theme settings, Additional CSS or a child theme?
• Will it survive the next theme update?
• Will you check it on phones and on the other pages?
• Will you work on a staging copy or on the live site?
• Will you install any plugins? Which ones, and are they licensed?
• What happens if the fix breaks something else?

Red flags

• edits the main theme’s files directly
• asks for your hosting account password for a CSS change
• asks to chat or pay outside Fiverr
• a “free” premium theme or plugin with no license key behind it, which is a pirated copy and can carry malware
• uses !important on everything instead of finding why the rule doesn’t apply
• installs a page builder or a big plugin for a one-line change

How to give access safely

Most CSS jobs need only a WordPress login. Give that, and nothing else, after you place the order.

1. Take your own backup first. Use your hosting panel or a backup plugin, and keep a copy off the server.
2. Copy your current CSS into a text file. Additional CSS has no backup of its own outside the database.
3. Create a separate WordPress user for the developer. Theme settings and Additional CSS need the Administrator role, so make the login temporary: the Temporary Login Without Password plugin lets it expire on its own. Never share your own login.
4. Give file access only for a child theme. If the job needs it, create a separate SFTP user in your hosting panel, not your hosting account password.
5. Never share your domain registrar, payment accounts or admin email. A CSS change doesn’t need any of them.

Send passwords through a password manager, not as text in chat. When the job is done, delete the WordPress user and any SFTP user you created.

What to send before the work starts

• the page address and the exact element: “the blue button under the header”
• a screenshot of how it looks now, and one of how you want it (or a site you like)
• whether it’s wrong on phones, desktop or both
• your theme name and version, and whether you use a child theme
• any page builder: Elementor, Divi, the block editor
• what you’ve tried and where you pasted any CSS
• whether a theme update is waiting, and whether you have a recent backup
• your deadline and the access you’re ready to give

Put these details in the order requirements so you can check the delivery against them.

If you used ChatGPT or Claude for CSS, include the snippet and say where you pasted it. Send screenshots of the intended change and anything else it affected. Ask the developer to check for overlapping rules before adding more CSS, then test the fix on phones and other pages that share the same header, menu or button.

After the fix: check, accept, keep it safe

Fiverr gives you three days to review a delivery before the order completes on its own. Check right away:

• the change on your phone and on a desktop
• every page that shares the element, not only the one you named
• the menu, forms and checkout, if the site has them
• a private window after clearing the site’s cache, so you’re not looking at an old copy

Ask for any changes through Fiverr before you accept. Have the developer note where the change lives. Keep a text copy of Additional CSS, or keep the child theme active when you update.

Then remove the developer’s access. Before the next theme update, take a backup and check the pages after. Regular maintenance can catch a broken layout before your visitors do.

Summary

Where a design change lives decides whether it survives the next update. For WordPress theme customization, choose a developer who uses Additional CSS or a child theme and checks the pages that share the element. Start with a single fix.