.overlay_section{
    background-color: #f5f5f5;
    position: relative;
    z-index: 1;
    height: 635px;
    &:after{
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        content: "";
        background-image: url(../img/single_about_overlay.png);
        background-position: center;
        background-repeat: no-repeat;
        background-size: contain;
    }
}