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: 9998;
  position: fixed;
  left: 0;
  bottom: -.68rem;
  width: 100%;
  height: .68rem;
  background: #fff
 }
}