一种页面居中弹窗的CSS写法 .pop{ padding:8px 12px 12px 12px; box-sizing:border-box; position:fixed; left:50%; top:50%; transform:translate(-50%,-50%); width:400px; max-width:99%; background:#FFF; box-shadow:0 4px 20px 0 rgba(0,0,0,0.4); z-index:9; } Nyan Kusanagi 大佬写法: .pop{ width:600px; max-width:100%; height:400px; margin:auto; position:fixed; top:0; right:0; bottom:0; left:0; background:#999; z-index:999; display:flex; align-items:center; justify-content:center; }