.knowledgeHub_headerImage.whiteGradient::after {

    background: -webkit-gradient(linear,left top,right top,color-stop(20%,#f4f4f4),color-stop(97.52%,rgba(255,255,255,.15)));
    background: linear-gradient(90deg,#f4f4f4 20%,rgba(255, 255, 255, 0.15) 60%);

}