DIV set to overflow:scroll, but wont scroll all the way to bottom

Question

I have a DIV menu that is set to 100% height with a overflow:scroll. Within the DIV I have a ul li. The problem I have is that it wont let me scroll all the way down to see the last li. I can barely see it.

I think it has something to do with my header because when I remove the header, I can see it. When I put back the header, it goes under the browser and cannot be scrolled all the way down to see the last li.

Both li and header are almost identical in height and it makes a lot of sense that the header is causing the problem. Not the header in particular, I think, but more of something I did in CSS.

Why cant I scroll all the way to the bottom? What is the solution?

Sample here: http://jsfiddle.net/D5KU3/2/

<div class="container">

<!--header-->
 <div class="header">
 </div>
<!--end header-->

<!--left-->
 <div class="left">

<!--ul starts here-->

  <ul>

  <li class="hybrid">

    <a href="#">
    <p class="title">Why Cant</p>
    <p class="type">I scroll all the way to the bottom</p></a>

  </li>

Repeat li 20 times

  </ul> <!--ul ends here-->

  </div> <!--container ends here-->

CSS

  body, html {
  height:100%;  
  }

  body {
  background:white;

  }

  .container {
  width:260px;
  height:100%;
  overflow:hidden;
  background:silver;
  margin:0 auto;
  font-family:sintony;
  }

  .header {
  width:100%;
  height:60px;
  background:#000;
  }

  .left {
  width:260px;
  height:100%;
  background:#fff;
  float:left;
  overflow:scroll;
  }


 li.hybrid a {
 display:block;
 background:#16BF14;
 height:60px;
 width:260px;
 text-decoration:none;
 position:relative;
 }



 li.purple a {
 display:block;
 background:#3370CC;
 height:60px;
 width:260px;
 text-decoration:none;
 position:relative;
 }

 p.title {
 position:relative;
 padding-left:10px;
 }

 p.type {
 font-size:12px;
 position:relative;
 padding-left:10px;
 }

 ul {
 margin:0;
 padding:0;
 }

 li p {
 margin:0;
 padding:0;
 list-style-type:none;
 }

Answer 1

As you have both the class="header" and class="left" elements in the container, and the class="left" element is 100% of the container, those are 100% plus 60 pixels together.

You can make room for the header by using box-sizing and padding-top in the container. That will make the inner size of the container 100% minus 60 pixels. Then use a negative top margin on the header to place it on top of that padding:

.container {
    box-sizing: padding-box;
    -moz-box-sizing: padding-box;
    -webkit-box-sizing: padding-box;
    padding-top: 60px;
}

.header {
    margin-top: -60px;
}

Demo: http://jsfiddle.net/Guffa/D5KU3/11/

You might also want to get rid of the page margin, otherwise the 100% container and the margin is taller than the window:

body {
    margin: 0;
    padding: 0;
}