#wpe_frame { position: fixed; top: 50%; left: 50%; width: 0px; height: 0px; box-shadow: 0px 0px 10px #000; border-radius: 0px; background-color: #FFF; z-index: 999991; min-height: 100%; } @media (max-width: 768px) { #wpe_frame { border-radius: 0px; } }