.jg_list .all a{
  display: block;
  width: 305px;
  margin-right: 20px;
  float: left;
  position: relative;
  transition: all .2s linear;
}
.jg_list .all a img{width: 100%;}
.jg_list .all a:hover{
  margin-top: -10px;
  box-shadow: 0px 1px 10px #000;
}
.jg_list .all a:last-child{margin-right: 0;}
.jg_list .all a span{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  text-shadow: 0px 1px 2px rgba(0, 0, 0, 0.8);
  font-weight: bold;
  color: #fff;
  font-size: 20px;
  text-align: center;
  width: 100%;
}