.waterfall .list-group { margin-right: 14px; }

.waterfall .list-group > li:first-child {
  padding: 0;
  background-color: white;
}

.waterfall .list-group > li:first-child img {
  width: 100%;
  border-top-right-radius: 4px;
  border-top-left-radius: 4px;
}

.waterfall .list-group > li { background-color: #f5f5f5; }
 @media (min-width: 768px) {

.waterfall .list-group { width: 346px; }
}
@media (min-width: 992px) {

.waterfall .list-group { width: 299px; }
}
@media (min-width: 1200px) {

.waterfall .list-group { width: 271px; }
}