.borders::before{ position: absolute; left: 0; top: 0; content: " "; width: 100%; height: 1px; border-top: 1px solid #ECECF0; -webkit-transform-origin: 0 0; transform-origin: 0 0; -webkit-transform: scaleY(0.5); transform: scaleY(0.5);/*缩放*/ }
原文：https://www.cnblogs.com/yangchin9/p/11279785.html