#videoList {width: 100%; float: left; margin: 20px 0; justify-content: center;}
#videoList iframe {max-width: 100%; height: 300px;}

#videoList .inner {width: 100%; float: left; justify-content: center;}
#videoList .inner .item {width: calc(50% - 20px); float: left; margin: 20px 20px 20px 20px;}
#videoList .inner .item:nth-child(2n) {margin-right: 0;}
#videoList .inner .item .title {font-size: 18px; font-weight: 700;}
#videoList .inner .item .video {}


@media (max-width: 600px) {
  
  #videoList .inner .item {width: 100%; margin: 5px 0;}
}