@media screen and (max-width: 550px) {
    #testimonial-section {
        display: none !important;
        visibility: hidden !important;
    }
    #wrap > section.kc-elm.kc-css-147604.wn-section.blox.clearfix.wn-section-131150.wn-kc-elm.stretch_section {
        display:none !important;
    }
}