* {
  box-sizing: border-box;
}
body{
	margin:0;
}
.wrappermasonry{
  position:relative;
  display:block;
  width:1250px;
  height:405px; 
  margin:0 auto;
  overflow:auto;
}
#basicmasonry{
	opacity:0;
}

.containermasonry {
  width:1250px;
  height:400px;
}

.item {
  width:  160px;
  float: left;
  background: #ffffff;
  margin-bottom: 10px;
}

.item.w2 { width: 330px; }
.item.w3 { width: 540px; }
.item.w4 { width: 720px; }

.item.h2 { height: 312px; }
.item.h3 { height: 540px; }
.item.h4 { height: 720px; }
.item.h5 { height: 900px; }

.stamp {
  background: red;
  opacity: 0.75;
  position: absolute;
  border: 1px solid;
}