.article {
  display: block;
  box-shadow: 0px 1px 2px 0px rgba(0, 0, 0, 0.05);
  transition: all 220ms;
}
.article:hover {
  box-shadow: 0px 2px 3px 1px rgba(0, 0, 0, 0.1);
  transform: translateY(-5px);
  transition: all 220ms;
}

.wall {
  display: block;
  position: relative;
}
.wall-column {
  display: block;
  position: relative;
  /*width: 33.333333%;*/
  width: 25%;
  float: left;
  padding: 0 12px;
  box-sizing: border-box;
}
@media (max-width: 640px) {
  .wall-column {
    width: 50%;
  }
}
@media (max-width: 480px) {
  .wall-column {
    width: auto;
    float: none;
  }
}