实际开发中常常少不了使用弹窗，在学习css3的时候我发现可以通过纯css实现带遮罩层可关闭的弹窗。
使用CSS3实现带遮罩层可关闭的弹窗需要用到 :target伪类，::before 、::after伪元素。
实现弹窗的代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
/*关闭弹窗*/
.popBox {
display: none;
} /*打开弹窗*/
.popBox:target {
align-items: center;
display: flex;
justify-content: center;
position: absolute;
left: 0;
right: 0;
top: 0;
bottom: 0;
}
/*设置弹窗内容*/
.popBox .con {
background-color: rgba(250, 188, 199, 0.76);
border-radius: 5px;
padding: 1.5rem;
position: relative;
width: 25rem;
}
/*关闭按钮*/
.popBox .close {
display: block;
position: relative;
}
.popBox .close::after {
align-items: center;
color: white;
content: "×";
cursor: pointer;
background-color: rgba(79, 79, 79, 0.9);
border-radius: 50%;
display: flex;
font-size: 1.25rem;
justify-content: center;
position: absolute;
right: -2.5rem;
top: -2.5rem;
height: 2rem;
width: 2rem;
z-index: 2;
}
/*弹窗遮罩层*/
.popBox::before {
content: "";
cursor: default;
background-color: rgba(173, 173, 173, 0.66);
position: fixed;
left: 0;
right: 0;
top: 0;
bottom: 0;
}
</style>
</head>
<body>
<ul>
<li><a href="#example1">案例1</a></li>
<li><a href="#example2">案例2</a></li>
</ul>
<article class="popBox" id="example1">
<div class="con">
<a href="#" class="close"></a>
<p>案例，就是人们在生产生活当中所经历的典型的富有多种意义的事件陈述。它是人们所经历的故事当中的有意截取。案例一般包括三大要素。案例对于人们的学习、研究、生活借鉴等具有重要意义。基于案例的教学是通过案例向人们传递有针对性的教育意义的有效载体。</p>
</div>
</article>
<article class="popBox" id="example2">
<div class="con">
<a href="#" class="close"></a>
<p>A case is a typical multi-meaning event statement that people experience in production and life. It is a deliberate interception of the stories people experience. Cases generally include three major elements. Cases are of great significance to people's learning, research, and life reference. Case-based teaching is an effective carrier to convey targeted educational significance to people through cases.</p>
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