<div class="add-tanchuang">123</div>
<style>
.add-tanchuang::before {
content: ""; /* 插入内容 */
cursor: default;
background-color: rgba(173, 173, 173, 0.66);
position: fixed;
left: 0;
right: 0;
top: 0;
bottom: 0;
}
</style>转载联系作者并注明出处：https://focusonseo.cn/css/91.html