* {
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
}
/* ---- isotope ---- */

.isotope {
  max-width: 1170px;
}

/* clear fix */
.isotope:after {
  content: '';
  display: block;
  clear: both;
}

/* ---- .item ---- */

.item {
  float: left;
  width: 100px;
  height: 100px;
}

.item.width-1 { width: 585px; }
.item.width-2 { width: 285px; }
.item.width-3 { width: 300px; }
.item.height-1 { height: 510px; }
.item.height-2 { height: 250px; }