body{background-color:#1A1919;text-align:center;}

.placeholder{
  display:inline-block;
  position:relative;
  width:600px;
  height:600px;
  overflow:hidden;
  box-sizing:border-box;
  margin-top:100px;
}

.gridContainer{
  width:100%;
  height:100%;
}

.gridTile
{
  position:absolute;
  top:0px;
  left:0px;
  width:100%;
  height:100%;
  background-size:cover;
  background-repeat:no-repeat;
  background-origin:center;
}