WooCommerce Color Dropdown Fix

Store is live on WordPress with WooCommerce using Divi. The background colour in the product variation dropdown doesn't work properly. I've tried adding css but it hasn't worked. There are also a couple of other styling issues on the checkout module. Everything else—cart, payments, inventory.etc. works OK.

I need someone to dive straight into the theme, any child-theme overrides and WooCommerce templates or scripts to pinpoint why the colour switcher isn’t responding. Please keep all current styling intact and avoid breaking existing functionality.

Deliverables
• Functional colour dropdown that updates the chosen shade immediately on selection
• Confirmation it works across desktop, tablet and mobile on at least three major browsers
• A short note of what you changed (file names or custom code snippets) so I can maintain it later

If you’ve fixed similar variation-display glitches before, this should be a quick win. Let me know your estimated turnaround and I’ll grant access right away.