Not sure what is wrong with my <link>

<!DOCTYPE html>
    <link href=""rel="stylesheet">
    <link href="font.css" rel="stylesheet">
    <link href="main.css" rel="stylesheet">


You have a typing mistake in that shift.css link, if you try to follow it you will see that you get an error. Try again with the working link.

There is no font.css file available to you in this project, you should remove that link.