If you want these CSS on just one page, you will have to embed them inside style tag:
//CSS statements goes here
If the styles are common for many pages, add a new CSS file (it shall have .css extension) to your project and move these styles to that file.
Then you reference the CSS file in the head section of your web page like this:
<link href="CSSFileName.css" rel="stylesheet" type="text/css" />
Hope that helps!