everything inside scrolling divs

by Jason Rose

HTML

<div class="pageBox">
            <div class="headerBox">
                Header
            </div>
            <div class="contentBox">
                <div class="contentBoxLeft">
                    <ul class="sections">
                        <li><a href="#">CSS Tutorial</a></li>
                        <li><a href="#">CSS HOME</a></li>
                        <li><a href="#">CSS Introduction</a></li>
                        <li><a href="#">CSS Syntax</a></li>
                        <li><a href="#">CSS How To</a></li>
                        <li><a href="#">CSS Backgrounds</a></li>
                        <li><a href="#">CSS Borders</a></li>
                        <li><a href="#">CSS Margins</a></li>
                        <li><a href="#">CSS Padding</a></li>
                        <li><a href="#">CSS Height/Width</a></li>
                        <li><a href="#">CSS Text</a></li>
                        <li><a href="#">CSS Fonts</a></li>
                        <li><a href="#">CSS Links</a></li>
                        <li><a href="#">CSS Lists</a></li>
                        <li><a href="#">CSS Tables</a></li>
                        <li><a href="#">CSS Box Model</a></li>
                        <li><a href="#">CSS Outline</a></li>
                        <li><a href="#">CSS Display</a></li>
                        <li><a href="#">CSS Max-width</a></li>
                        <li><a href="#">CSS Position</a></li>
                        <li><a href="#">CSS Float</a></li>
                        <li><a href="#">CSS Inline-block</a></li>
                        <li><a href="#">CSS Align</a></li>
                        <li><a href="#">CSS Combinators</a></li>
                        <li><a href="#">CSS Pseudo-class</a></li>
                        <li><a href="#">CSS Pseudo-</a></li>
                        <li><a href="#">CSS Navigation</a></li>
                        <li><a href="#">CSS Image Gallery</a></li>
                        <li><a...

CSS

@import url(https://fonts.googleapis.com/css?family=Raleway:200,300,400,500,700);

body, html {
}
body {
	font-family: 'Raleway', sans-serif;
    font-size: 14px;
}
.pageBox{
    position:  absolute;
    top:  0;
    left:  0;
    right:  0;
    width:  1024px;
    margin: 0 auto;
    bottom: 0;
    min-width: 200px;
}
.headerBox{
    position: absolute;
    width: 100%;
    height: 50px;
    background: lightgreen;
}
.contentBox{
    position: absolute;
    width: 100%;
    top: 42px;
    bottom: 22px;
    margin-top: 20px;
    margin-bottom: 20px;
}
.footerBox{
    position: absolute;
    width: 100%;
    height: 30px;
    bottom: 0px;
    background: lightgreen;
}
.contentBoxLeft{
    position: absolute;
    width: 20%;
    height: 100%;
    border-left: 0;
    border-right: 1px solid;
    border-image: linear-gradient(#545454,#fff) 0 100%;
    background: lightyellow;
}
.contentBoxRight{
    display: block;
    position: absolute;
    width: 80%;
    left: 20%;
    height: 100%;
}
.contentBoxRight, .maincontent {
    display: block;
    width: 80%;
    left: 20%;
    height: 100%;
}
.contentBoxRight {
    /* specify fixed width */
    width: 80%;
    height: 100%;
    padding: 0;
}

.maincontent {
    /* specify padding, can be changed while remaining fixed width of .outer */
    width: auto;
    padding: 0 20px 0 30px;
}
.contentBoxLeft, .contentBoxRight{
    overflow: auto;
    overflow-x: hidden;
}
ul.sections {
    list-style-type: none;
    margin: 0;
    padding: 0;
    /*background-color: #f1f1f1;*/
}
ul.sections li {
    font-size: 13px;
    font-weight: 400;
}
ul.sections > li:first-child {
    padding: 0px 6px 1px 0px;
}
ul.sections > li:last-child {
    padding: 0px 6px 1px 0px;
    height: 10px;
}
ul.sections li a {
    display: block;
    color: #555;
    padding: 6px 6px 1px 0px;
    text-decoration: none;
}
ul.sections li a:hover:not(.active) {
    padding: 6px 6px 0px 0px;
    border-bottom: 1px dashed #545454;
}
ul.sections li a.active {
   ...