how to divide web page into different sections which scroll independently code example

Example: how to divide web page into different sections which scroll independently

#content, html, body {
    height: 98%;
}
#left {
    float: left;
    width: 50%;
    background: red;
    height: 100%;
    overflow: scroll;
}
#right {
    float: left;
    width: 50%;
    background: blue;
    height: 100%;
    overflow: scroll;
}