.iframe-box{display:flex;flex-wrap:wrap;justify-content: space-between;margin:2% 0;}
.iframe-box .item{width:49%;}
.iframe-box .iframe-container{position: relative;width:100%;height:0;padding-bottom: 56.25%;}
.iframe-box .iframe-container iframe{position:absolute;top:0;left: 0;width:100%;height:100%;min-height:inherit;max-height:inherit;}
@media (max-width:768px){.iframe-box .item{width:100%;}
.iframe-box .item:nth-child(2){margin-top:2%;}}