.fusion-vimeo-wrapper {
    position: relative;
    width: 100%;
    height: 0;
    overflow: hidden;
}

.fusion-vimeo-wrapper.ratio-16-9 {
    padding-top: 56.25%; /* 16:9 */
}

.fusion-vimeo-wrapper.ratio-4-3 {
    padding-top: 75%; /* 4:3 */
}

.fusion-vimeo-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}