header::after {
    content: '';
    position: absolute;
    background: url(https://websima.com/wp-content/themes/websima/2021/assets/img/g-h2.png);
    -webkit-background-size: contain;
    -moz-background-size: contain;
    -o-background-size: contain;
    background-size: contain;
    width: 238px;
    height: 144px;
    left: -webkit-calc(50% - 119px);
    left: -moz-calc(50% - 119px);
    left: calc(50% - 119px);
    bottom: -105px;
    -webkit-clip-path: polygon(0 0, 100% 0, 100% 100%, 0% 100%);
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0% 100%);
    -webkit-transition: 0.5s ease;
    -o-transition: 0.5s ease;
    -moz-transition: 0.5s ease;
    transition: 0.5s ease;
    -webkit-background-size: 100% auto;
    -moz-background-size: 100% auto;
    -o-background-size: 100% auto;
    background-size: 100% auto;
    background-position: 0 -47px;
}

header.sticky:after {
    opacity: 0;
    -webkit-clip-path: polygon(0 0, 100% 0, 100% 0, 0 0);
    clip-path: polygon(0 0, 100% 0, 100% 0, 0 0);
}