Its Minecraft, not Minecarft.
As for the CSS you can't seem to load, where in the server is the CSS kept?
If its in the same folder as the web page, you only need to use the name of the file not add a path.
if the css is in the same folder as /mypage.html then your sytlesheet is loaded by ./mycsssheet.css type path, if you use anything else, the browser is trying to request a non existent file from a path that does not exist.
Where is the CSS kept in relation to the webpage calling it?