The CSS you posted are not clear, could be the auto formatting on that site chew up some of the syntax. For instance there no closing tag for .navbar-toggle {
Anyway, there are couple of issues with the header section
1. the meta tag should be
<meta name="description" content="" />
and not
<meta name="description" content=""></meta>
2. same with the CSS link. It should be
<link rel="stylesheet" href="style.css" />
and not
<link rel="stylesheet" href="style.css"></link>
It would be great if you can provide a screenshot of what exactly is the problem.