.thumb_txt .ttl + .ttl { color: gray; font-weight: normal; }
.thumb_txt img { width: 100%; }

@media (max-width: 560px) { .youtube_box .youtube_inbox { position: relative; }
  .youtube_box .youtube_inbox:before { content: ""; display: block; height: 0; overflow: hidden; padding-top: 56.25%; }
  .youtube_box .youtube_inbox > iframe { height: 100% !important; left: 0; position: absolute; top: 0; width: 100% !important; } }
.talk { margin-left: 6em; }
.talk:before, .talk:after { content: ""; display: table; }
.talk:after { clear: both; }
.talk { *zoom: 1; }
.talk > dt { clear: both; float: left; margin-left: -6em; margin-right: 1em; }
.talk > dd { margin: auto auto 1em; }

@media (max-width: 640px) { .talk { margin-left: 4em; }
  .talk > dt { margin-left: -4em; } }