You appear to have created this post without editing the template. Please edit your post to Tell us what’s happening in your own words.
Learning to describe problems is hard, but it is an important part of learning how to code.
Also, the more you say, the more we can help!
Your code passes for me. Do you have any browser extensions installed? Especially any extensions that change the styles on the page, such as a dark mode extension. If so, that is probably what is causing the problem. Extensions like that will fool the tests. You can either disable the extensions or switch to a “clean” browser without any extensions installed.