示例:

代碼:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>偽元素after和before的用法</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; /*設置為塊級元素會獨占一行形成上下居中的效果*/ font-size: 3em; color: #212121; position: relative; /*定位橫線(當橫線的父元素)*/ } h3.title span:before, h3.title span:after { content: ''; /*CSS偽類用法*/ position: absolute; /*定位背景橫線的位置*/ top: 52%; background: #494949; /*寬和高做出來的背景橫線*/ width: 9%; height: 2px; } h3.title span:before{ left: 25%; /*調整背景橫線的左右距離*/ } h3.title span:after { right: 25%; } </style> </head> <body> <div class="container"> <h3 class="title">I love you<span>Hello</span></h3> </div> </body> </html>
我來分割線-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
新增漸變色,效果圖類似下面

h3.title span:before, h3.title span:after {
content: ''; /*CSS偽類用法*/
position: absolute; /*定位背景橫線的位置*/
top: 52%;
/* background: #494949; 寬和高做出來的背景橫線*/
width: 9%;
height: 2px;
}
h3.title span:before{
left: 25%; /*調整背景橫線的左右距離*/
background:linear-gradient(to left,#b6b6b6,#efefef);
}
h3.title span:after {
right: 25%;
background:linear-gradient(to left,#efefef,#b6b6b6);
}
可以試一下以下的代碼:是一個漸變的效果
<div style="background:linear-gradient(to left,#efefef,#b6b6b6,#efefef);height:1px;"></div>
