.embed-responsive-3by1::before {
    padding-top: 33.3333333333%;
}
.embed-responsive-8by3::before {
    padding-top: 37.5%;
}

.wb-zoom {
    transition: opacity 0.5s, transform 0.5s;
}
.wb-zoom:hover {
    opacity: 0.8;
    transform: scale(1.05);
}