height: calc(px2rem(110) + constant(safe-area-inset-bottom));
  height: calc(px2rem(110) + env(safe-area-inset-bottom));
  padding-bottom: constant(safe-area-inset-bottom); /*兼容 IOS<11.2*/
  padding-bottom: env(safe-area-inset-bottom); /*兼容 IOS>11.2*/