body {
    background-color: #d6ebfa;
}

.site {
    margin: 40px auto;
    width: 90% ; /* 940px */
}

.sidebar {
    background-color: #fdffc7;
    float: left;
    text-aline: center;
    width: 32.446809% ;/* 305px / 940px = 0.324468 */
}

.content {
    background-color: #fff;
    box-shadow: 0px 3px 4px rgba(0, 0, 0, .3);
    margin-left: 34.574468% ; /* 325px / 940px */
    padding: 3.389830% ; /* 20px / 590px : padding = within box*/;
    width: 62.765957%; /*590px / 940px */
}