.whell_iframe_wrapper {
    width: 100%;
    height: 600px;
    position: relative;
}
.whell_iframe_wrapper iframe {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
}
@media (max-width: 900px) {
    .whell_iframe_wrapper {
        height: 1000px;
    }
}