* {
    box-sizing: border-box;
    margin: 0px;
    padding: 0px;
}

header {
    /* Top, bottom, left, right */
    padding: 10px;
    /* Top/bottom, left/right,  */
    padding: 0px 10px;
    /* Top, left/right, bottom */
    padding: 0px 10px 10px;
}

footer {
    padding: 10px 10px 0px;
}

#container {
    padding: 10px;
    background-color: tomato;
}

#sidebar,
#content {
    background-color: white;
    border: 1px solid black;
    padding: 10px;
}

#sidebar {
    float: left;
    height: 500px;
    width: 200px;
}

#content {
    float: right;
    height: 500px;
    width: calc(100% - 210px);
}

footer {
    clear: both;
}