Moodle: Hide the footer

I'm new to Moodle and I have just a very basic knowledge of css. I have installed a theme in moodle and there is a very annoying footer at the top of the page. I wanted to change the background color or hide it via CSS but I can't find the CSS file. In the theme folder there are some css file, but even if I delete everything, the footer stays with this annoying background color. When I inspect it with chrome I see this. [LINK][1] [1]: https://i.sstatic.net/6IToo.png I just want to edit the CSS file, but I can't find it. I have the feeling that this css settings are generated dinamically somehow, but I really have no idea how to do this.