@media screen and (max-width: 750px) { 
    .iframe_box .iframes { width: 100% !important; }
}
  .iframe_box { display: flex; flex-wrap: wrap; justify-content: space-between;}
  .iframe_box .iframes { width: 48%;  margin-bottom: 50px;}
  .iframe_box .iframes .name {text-align: center;}
  iframe { width: 100%; margin-bottom: 50px;}