#main #sideBar {
    position: relative;
    display: inline-block;
    box-sizing: border-box;
    width: 15%;
    vertical-align: top; 
    background-color: #FFF;
    padding: 24px;
    font-size: 14px;
}
#main #mainContent {
    position: relative;
    display: inline-block;
    box-sizing: border-box;
    width: 85%;
    vertical-align: top;
    font-size: 14px;
    padding-right: 16px;
}