@media screen and (max-width: 768px) {
  /* CENTERED */
  #centered {
    padding-top: 250px;
    background: #FFF;
  }
  #centered li {
    width: 31%;
  }
  #centered li:first-child, #centered li:last-child {
    display: none;
  }
}
/* Tile Grid */
.tiles { display: block;  }
.tiles > li { display: block; height: auto; float: left; padding-bottom: 0; }
.tiles.two_up { margin-left: -4%; }
.tiles.two_up > li { margin-left: 4%; width: 46%; }
.tiles.three_up, .tiles.four_up { margin-left: -2%; }
.tiles.three_up > li { margin-left: 2%; width: 31.3%; }
.tiles.four_up > li { margin-left: 2%; width: 23%; }
.tiles.five_up { margin-left: -1.5%; }
.tiles.five_up > li { margin-left: 1.5%; width: 18.5%; }