一种是通过transform中的scale
border: 1px solid red; transform: scaleY(.5);
一种是通过meta viewport中设置init-scale为0.5
<meta name="viewport" content="width=device-width, initial-scale=0.5">
一种是设置hr
border: 0px; border-bottom: 1px solid red;
一种是基于背景渐变实现
height: 2px; background-image: linear-gradient(0deg, red 50%, transparent 50%)
