.open-menu-mobile {
    display: none;
    position: absolute;
    right: 20px;
    top: 20px;
    height: 30px;
    width: 30px;
    border: none;
    background-color: transparent;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    color: white;
    line-height: 52px;
}
@media only screen and (max-width: 768px) {
    .open-menu-mobile {
        display: block;
    }
}