#header, #footer {
    margin: 0;
    height: 10%;
    width: 100%;
    background-color: gray;
}
.left, .right {
    margin: 0;
    display: inline-block;
    height: 80%;
    width: 10%;
    background-color: yellow;
}
.right {
    float: right;
}
#footer {
    clear: both;
}
.center{
    margin: 0;
    background-color: red;
    height: 79.7%;
    width: 79.7%;
    display: inline-block;
}