div#main-container:before {
    content: "";
    display: block;
    width: 50%;
    height: 500px;
    position: absolute;
    top: 645px;
    background: #eef1f2;
    box-shadow: inset -30px 0 0 0px #FFF;
}

div#main-container:after {
    content: "";
    width: 100%;
    height: 310px;
    background: #EEF1F2;
    display: block;
    position: absolute;
    right: 0;
    top: 1525px;
    border-left: 30px solid #EEF1F2;
}