.thumbnail {
  display: block;
  padding: 4px;
  margin-bottom: 20px;
  line-height: 1.428571429;
  background-color: #ffffff;
  border: 1px solid #dddddd;
  border-radius: 4px;
  -webkit-transition: all 0.2s ease-in-out;
          transition: all 0.2s ease-in-out;
}

.thumbnail > img,
.thumbnail a > img {
  display: block;
  height: auto;
  max-width: 100%;
  margin-right: auto;
  margin-left: auto;
}

a.thumbnail:hover,
a.thumbnail:focus,
a.thumbnail.active {
  border-color: #428bca;
}

.thumbnail .caption {
  padding: 9px;
  color: #333333;
}