#grid {
  margin: 40px auto;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
#grid-content {
  position: relative;
}
#grid-content .grid-item:hover {
  cursor: pointer;
}
#grid-content .grid-item img {
  width: 100%;
}
.grid:after {
  content: "";
  display: block;
  clear: both;
}
.grid-item,
.grid-sizer {
  width: 33%;
}
.grid-item {
  float: left;
  padding: 1px;
}
@media screen and (max-width: 425px) {
  .grid-item,
  .grid-sizer {
    width: 100%;
  }
}