.markdown-section iframe[src*='buttons.github.io'] {
    margin: 0;
  }
  
  figure.thumbnails img {
    margin: 0.75em 0;
    border-radius: 3px;
    box-shadow:
      0 2px 6px rgba(0, 0, 0, 0.1),
      0 4px 12px rgba(0, 0, 0, 0.15);
  }
  
  @media (min-width: 30em) {
    figure.thumbnails:after {
      content: '';
      display: table;
      clear: both;
    }
  
    figure.thumbnails img {
      float: left;
      width: calc(50% - 0.75em);
    }
  
    figure.thumbnails img:nth-child(even) {
      margin-left: 1.5em;
    }
  
    @supports (display: flex) {
      figure.thumbnails {
        display: flex;
        align-items: center;
      }
  
      figure.thumbnails img {
        flex-grow: 1;
        width: 0;
      }
  
      figure.thumbnails img + img {
        margin: 0 0 0 1.5em;
      }
    }
  }