.vidifbox{display: flex;justify-content: space-between;flex-wrap: wrap;}
.vidifbox .item{width: 48%;margin-bottom: 20px;}
.vidifbox .item iframe{width: 100%;height: auto;aspect-ratio: 90/53;}
@media (max-width:768px) {
.vidifbox .item{width: 100%;}
}