CSS实现 全屏 遮罩

遮罩 CSS:.divBG { ????background: gray; ????position: fixed; ????left: 0px; ????top: 0px; ????width: 100%; ????height: 100%; ????display: none; ????z-index: 20; ????filter: alpha(opacity=60); ????opacity: 0.5 !important; }

弹出层 CSS:.PopUp { ????position: fixed; ????display: none; ????z-index: 50 !important; ????background-color: White; ????width: 900px; ????border-style: solid solid solid solid; ????border-width: 5px 5px 5px 5px; ????border-color: #cccc99; ????left: 50%; ????top: 50%; ????margin-top: -200px; /*--高度的一半--*/ ????margin-left: -450px; /*--宽度的一半--*/ }