.world {
  position: relative;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

.item {
  position: absolute;
  top: 0; left: 0;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  -o-box-sizing: border-box;
  -ms-box-sizing: border-box;
  box-sizing: border-box;
}