.ss-editor-zone {
    margin-top: 30px;
    line-height: 1.6;
}
.agv-video-player {
    position: relative;
    width: 100%;
    max-width: 800px; /* optional */
    padding-bottom: 56.25%; /* 16:9 ratio */
    height: 0;
}

.agv-video-player iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}