css方法 - 移动端h5在iphonex的适配

 @media only screen and (device-width:375px) and (device-height:812px) and (-webkit-device-pixel-ratio:3) {
  body:after {
   content: '';
   z-index:;
   position: fixed;
   left:;
   bottom: -.68rem;
   width: 100%;
   height: .68rem;
   background: #fff
  }
 }