.v-center-columns {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%;
    overflow: hidden;
}

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