How can I create a fully customized Chrome theme that works seamlessly across different screen sizes and resolutions?

I’ve been trying to design my own Chrome theme to personalize my browser experience, but I struggle with ensuring that the background images and color schemes look consistent on various devices and screen sizes. While tools like Chrome Theme Creator help with basic customization, I want to dive deeper by editing the manifest.json file manually to achieve more control. However, I’m unsure about best practices for image resolution, alignment, and color contrast to maintain usability and aesthetics across desktops and laptops with different displays.

I’m also interested in tips on how to test and fine-tune themes efficiently without needing to reload them repeatedly or encounter bugs. If anyone has experience or resources on advanced Chrome theme development, including JSON structure tweaks and deployment tips, I’d really appreciate the guidance.

https://gthemes.org/create-a-theme-chrome-full-guide-to-make-your-browser-unique/

Thanks in advance!