移动端小于1px边框

.border-top{position: relative;border-top: none !important;}
.border-top:after {
    content: " ";
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 1px;
    background-color: #D5D5D6;
    -webkit-transform-origin: 0 0;
    -ms-transform-origin: 0 0;
    transform-origin: 0 0;
    -webkit-transform: scaleY(0.5);
    -ms-transform: scaleY(0.5);
    transform: scaleY(0.5);
}