Codecademy Sample Solution: Codeyear Fun with fixed positions

/* sample solution to style.css */
#red
{
    background-color: red;
    height: 2000px;
    width: 100px;
    float: left;
}
#blue
{
    background-color: blue;
    height: 400px;
    width: 200px;
    float: left;          
}
#greenFixed
{
    background-color: green;
    height: 100px;
    width: 200px;
    position: fixed;
    float: left;    
    z-index: -5;
}