移动端1px细线问题

1可以用伪类实现

.con{position: relative;
.con:before {
    content: " ";
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    height: 1px;
    border-top: 1px solid #d9d9d9;
    color: #d9d9d9;
    -webkit-transform-origin: 0 0;
    transform-origin: 0 0;
    -webkit-transform: scaleY(.5);
    transform: scaleY(.5);
    left: 15px;
}

2.直接0.02rem  border:0.02rem solid #ccc;