下拉菜单中的背景颜色问题

Question

Look at this

http://jsfiddle.net/esTzk/

How come the color on my #header won't apply ?

Answer 1

Give it a height or hide the overflow and it will. Either will work in this case.

#header{
  background:#2b2b2b;
  color:#fff;
  width:100%;
  height:200px; /* overrides float calculations */
  overflow:hidden; /* clears floats */
}

http://jsfiddle.net/AlienWebguy/esTzk/1/