.sample-images {
  margin: 12px 0;
}

.sample-images a {
  width: 32%;
  margin-bottom: 12px;
  display: block;
  float: left;
  box-sizing: border-box;
}

.sample-images img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
}