<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style> .container{ width: 1000px; margin: 10px auto; border: 1px solid red; } h3.title { color: #F2AE11; font-size: 1.3em; margin-bottom: 3em; text-align: center; font-weight: 500; line-height: 1.1; } h3.title span { display: block; /*设置为块级元素会独占一行形成上下居中的效果*/ font-size: 3em; color: #212121; position: relative; /*定位横线（当横线的父元素）*/ } h3.title span:before, h3.title span:after { content: ''; /*CSS伪类用法*/ position: absolute; /*定位背景横线的位置*/ top: 52%; background: #494949; /*宽和高做出来的背景横线*/ width: 9%; height: 2px; } h3.title span:before{ left: 25%; /*调整背景横线的左右距离*/ } h3.title span:after { right: 25%; } </style> </head> <body> <div class="container"> <h3 class="title">Welcome to <span>Snapshot</span></h3> <div class="row"> </div> </div> </body> </html>