.modul.stage-video .wp-block-video {
    border: 1px solid gray;
    width: calc(50% - 16px);
    margin: auto 8px!important;
    display: inline-block;
    height: 300px;
    vertical-align: top;
    padding: 8px;
}

.modul.stage-video .wp-block-video video {
    height: calc(300px - 16px);
}