Capybara would look into it 👍🏼. This current code is just a quick solution for meantime - with some ability to set and remove certain aspects of the extension as preferred that appears upon enabling the extension.
On my flarum here, I found that it improves the appearance where it eliminate the additional change which appears when the extension is enabled, but then, it also minorly change certain aspects such as the color of the search field text and color on hover, however found it to be minor and acceptable for now, as for my flarum i am not into styling yet but focusing on security and functionality followed by launching it soon first.
I do have plan to optimise the whole css that i currently have on my custom css which includes this to ensure effective implementation, minimalise redundancy etc. I'll look into this further, and update the improved version 👌🏼.