.content .content-product .product-item {
  display: inline-block;
  vertical-align: top;
  position: relative;
  width: 200px;
  margin-bottom: 20px;
  cursor: pointer;
  margin-right: 20px;
}
.content .content-product .product-item:nth-child(4n) {
  margin-right: 15px;
}
.content .content-product .product-item:hover .product-mask {
  display: block;
}
.content .content-product .product-item>a{
width:200px;
height:200px;
display:block;
line-height:200px;
text-align:center;
}