how to draw a rectangle in HTML or CSS?

Question

I am trying to draw a rectangle and I found the website for css code(http://css-tricks.com/examples/ShapesOfCSS/). How do I put together in HTML? In other words, how do I define #rectangle in HTML.

Facebook always has blue rectangle at the top of each page. What is the best way to achieve like them?

I appreciate if someone could help me.

Answer 1

Fiddle

HTML

<div id="rectangle"></div>

CSS

#rectangle{
    width:200px;
    height:100px;
    background:blue;
}

I strongly suggest you read about CSS selectors and the basics of HTML.