If you’ve learned CSS from the ground up, you should have a good understanding of the box model. But if you’re unfamiliar ...

The CSS code for your page may be located in the head section or in a separate CSS file linked to from the head. In the CSS code, add this to identify the header element: Add CSS declarations to ...

Scan through the CSS code and and locate the section governing the header. It begins with a hash symbol, and will look like this: Add some CSS code to position the header.

CSS: Enter CSS to be applied to the HTML used in your tests. It is placed between <style> elements in the header portion of the page. HTML: This area allows you to enter HTML to be used in your tests.