JS弹窗遮罩 POP

html:

<div class="popBox">
     <div class="pb">
          <span class="clousx"></span>
          <div class="p-box"></div>
     </div>
</div>   

css:

.popBox {
  position: fixed;
  width: 100%;
  left: 0;
  top: 0;
  background: rgba(0,0,0,0.5);
  height: 100%;
  z-index: 150000;
 }
 .popBox .pb {
  width: 6.58rem;
  background: #fff;
  display: flex;
  justify-content: space-between;
  position: relative;
  font-size: 0.3rem;
  text-align: left;
  left: 0.46rem;
  padding-top: 0.65rem;
  border-radius: 0.1rem;
  padding: .92rem .5rem .64rem .3rem;
  margin-top: 2rem;
  overflow-y: auto;box-sizing: border-box;
 }
 .popBox .clousx {
  position: absolute;
  z-index: 20000;
  width: 1rem;
  height: 0.84rem;
  background: url(../images/index/close-icon.png) no-repeat center center;
  background-size: 0.32rem 0.32rem;
  display: inline-block;
  right: 0;
  top: 0;
}
.popBox  .p-box {
  position: relative;
  height: 7rem;
  overflow-y: auto;
}