#youtube_area{width:100%}#youtube_area .list{display:flex;flex-wrap:wrap;padding:10px 0;width:100%}#youtube_area .list a{display:block;padding:5px;width:25%}#youtube_area .list a img{width:100%}@media only screen and (max-width:640px){#container.responsible #youtube_area .list a{width:50%}}