.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;
    }
  }
}