Hi @CarCleanCC , thanks for your information.
Upon checking, I noticed that you have successfully customized the CSS on your own. However, you placed the code at the end of the tag (), which causes your customizations to take effect only after the header has been rendered.
In this case, I recommend you continue using the same code but move it to the top, right after the tag. This way, the CSS will be read before the header is rendered, and the issue will be resolved.
I hope my solution is helpful to you, and please feel free to feedback.
Liz