html,body{
    margin: 0;
    padding: 0;
}

header {
    width: 100%;
    height: 100px;
    background-color: yellow;
}

#left {
    width: 150px;
    height: 200px;
    background-color: blue;
}

section {
    width: 400px;
    height: 200px;
    background-color: orange;
}

#right {
    width: 200px;
    height: 200px;
    background-color: red;
}

footer {
    width: 100%;
    height: 100px;
    background-color: black;
}