纯 css 实现自适应的弹框

代码如下

<div class="container">
    <div class="dialog">
        <div class="content">
           阿强爱分享
        </div>
    </div>
</div>

CSS代码

.container{
    position: fixed;
    top:0;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0,0,0,.5);
    text-align: center;
    white-space: nowrap;
    z-index: 99;
}
.container:after{
    content: '';
    display: inline-block;
    height: 100%;
    vertical-align: middle;
}
.dialog{
    background-color: #fff;
    display: inline-block;
    vertical-align: middle;
    border-radius: 6px;
    text-align: left;
    white-space: normal;
    width: 400px;
    height: 250px;
}