padding 的值,不能为负数。
使用 absolute 后,在定义好 width 和 height ,使用 border 的 width 和 height 会变大、变宽。
设置好看的细线
.thinBorder:after{
content: '';
width: 100%;
display: block;
border-top: 1px solid #ccc;
position: absolute;
left: 0;
bottom: 0px;
-webkit-transform: scaleY(0.5);
-webkit-transform-origin: 0% 0%;
}

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