问HTML / CSS -带有图片的交叉形状

EN

#cross {
   width: 100px;
   height: 100px;
   position: relative;
}

#cross:before, #cross:after {
  content: "";
  position: absolute;
  z-index: -1;
  background-size:100px 100px;
  background-image:url('http://www.gm-consult.de/uploads/pics/homer-simpson_20.jpg');
  background-position:center;
}

#cross:before {
  left: 50%;
  width: 30%;
  margin-left: -15%;
  height: 100%;
  -webkit-transform: rotate(45deg); 
  -moz-transform: rotate(45deg);
}

#cross:after {
  top: 50%;
  height: 30%;
  margin-top: -15%;
  width: 100%;
  -webkit-transform: rotate(45deg); 
  -moz-transform: rotate(45deg);
}