body { 
     background-color: #efefef;
     background-image: url(https://www.cnblogs.com/images/cnblogs_com/sciorz/1203177/o_d9c6178ba3a113cec025ee0648e7fae7.jpg);
     background-repeat: no-repeat; 
     background-attachment: fixed; 
     background-position: center 0; 
     background-size: cover; 
opacity: 0.732;
  }



.del_tip {
  text-align: center;
  width: 125px;
  height: 203px;
  position: absolute;
  background: rgba(0, 0, 0, 0.5);
  display: none;
}
.del_tip .del_tip_word {
  position: inherit;
  top: 45%;
  left: 50%;
  margin-top: -25px;
  margin-left: -35px;
  color: #fff;
}
.del_tip .del_tip_word p {
  font-size: 16px;
  margin-bottom: 25px;
}
.del_tip .del_tip_word .sure {
  width: 50px;
  height: 25px;
  background: #ff4040;
  padding: 5px 10px;
  margin-left: -19px;
  cursor: pointer;
}
.del_tip .del_tip_word .cancle {
  width: 50px;
  height: 25px;
  background: #bbb;
  padding: 5px 10px;
  margin-left: 10px;
  cursor: pointer;
}