.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;
      }
  }
}