.masonry {  
  column-count:3;
  -moz-column-count:3; /* 火狐 */
  -webkit-column-count:3; /* Safari 和 谷歌 */

  -moz-column-count:3;
  -moz-column-gap: 1em;
  -webkit-column-gap: 1em;
  column-gap: 1em;
  width: 95%;
  margin:1em auto;
}
.item {
  /*padding: 1em;*/
  margin-bottom: 1em;
  -moz-page-break-inside: avoid;
  -webkit-column-break-inside: avoid;
  break-inside: avoid;
  background: #ffffff;
  border-radius: 10px;
  font-size:12px;
  text-align:center;
  position:relative;
}
 
@media screen and (max-width: 1024px) {
  .masonry {
    column-count: 2; 
  }
}
@media screen and (max-width: 500px) {
  .masonry {
    column-count: 1;
  }
}
.pb_bg {
     background: #f5f5f5;
}
/*浮标*/
.fb{
      color: #fff;
    /*height: 40px;
    width: 100px;*/
    position: absolute;
    right: 10px;
    text-align: center;
    line-height: 40px;
    font-family: "黑体";
    background-color: #7A6E6E;
    top: 0px;
    padding: 0px 10px 0px 10px;
}