移动端1像素实现

.bor-bottom{    position: relative;    border-top: none !important;  }  .bor-bottom::after {    content: " ";    position: absolute;    left: 0;    bottom: 0;    width: 100%;    height: 1px;    background-color: #e4e4e4;    -webkit-transform-origin: left bottom;    transform-origin: left bottom;  }  @media only screen and (-webkit-min-device-pixel-ratio: 1.5) {    .bor-bottom::after {      -webkit-transform: scaleY(0.7);      transform: scaleY(0.7);    }  }  @media only screen and (-webkit-min-device-pixel-ratio: 2.0) {    .bor-bottom::after {      -webkit-transform: scaleY(0.5);      transform: scaleY(0.5);    }  }  @media only screen and (-webkit-min-device-pixel-ratio: 2.5) {    .bor-bottom::after {      -webkit-transform: scaleY(0.33333334);      transform: scaleY(0.33333334);    }  }  /* 3倍屏 */  @media only screen and (-webkit-min-device-pixel-ratio: 3.0) {    .bor-bottom::after {      -webkit-transform: scaleY(0.33);      transform: scaleY(0.33);    }  }