You properly used the "html" and "body" CSS selectors at the top of your file to set some defaults, but then you went ahead and wrote some of the styles over again. For example, in both the "html" and "body" CSS selectors, you set the default font. This means that the default font is set for the entire body, so you should never need to set the font again, but you wrote it in a few different places. Remember to erase these lines, they're not actually doing anything new!
https://github.com/jeano0o/Colmar/blob/820f3445f7739bf5e561e4c68de122efeb4bd247/Colmar/resources/style.css#L87
You properly used the "html" and "body" CSS selectors at the top of your file to set some defaults, but then you went ahead and wrote some of the styles over again. For example, in both the "html" and "body" CSS selectors, you set the default font. This means that the default font is set for the entire body, so you should never need to set the font again, but you wrote it in a few different places. Remember to erase these lines, they're not actually doing anything new!