@media only screen and (max-width: 800px) { article.dekochan iframe { width: 96vw; margin: 1vw 0; }
  article.dekochan a.youtube { display: block; width: 94vw; margin: 3vw auto 0 auto; }
  article.dekochan a.youtube img { width: 100%; }
  article.dekochan a.youtube:hover { opacity: 0.7; }
  article.dekochan div.gallery { display: flex; flex-wrap: wrap; margin-right: -3vw; }
  article.dekochan div.gallery div.block { overflow: hidden; width: 22vw; height: 16vw; margin: 0 2vw 2vw 0; }
  article.dekochan div.gallery div.block img { display: block; width: 100%; margin-bottom: 1vw; } }
@media only screen and (min-width: 801px) { article.dekochan iframe { width: 100%; height: 410px; margin: 10px 0; }
  article.dekochan a.youtube { display: block; width: 640px; margin: 20px auto 0 auto; }
  article.dekochan a.youtube img { width: 100%; }
  article.dekochan a.youtube:hover { opacity: 0.7; }
  article.dekochan div.gallery { display: flex; flex-wrap: wrap; margin-right: -30px; }
  article.dekochan div.gallery div.block { overflow: hidden; width: 120px; height: 90px; margin: 0 18px 18px 0; }
  article.dekochan div.gallery div.block img { display: block; width: 100%; margin-bottom: 10px; } }