.clearfix::after {
  display: block;
  content: "";
  clear: both;
}

.iframe-blcok {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
}

.iframe-blcok .iframe-blcok__iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.birds_vs_blocks__iframe-blcok {
  margin-top: 50px;
}