Html div width 100% not functioning

Question

There are some problems with my HTML, so I am posting the code.

The first tag is a div with id=\"header\". I have given it 100% width and g

Answer 1

I have found the solution:

#header {
  height: 156px;
  min-width: 990px;
  background-image: url('http://www.webdesignideas.org/images/bellevueBg.gif');
  display: block;
}

#head-contents {
  width: 974px;
  margin: 0 auto;
  height: 156px;
}

It's all a matter of min-width in the #header. I checked out facebook's login page and figured it out.