.md-backdrop{position:absolute;top:0;right:0;bottom:0;left:0;z-index:99;pointer-events:none;background-color:rgba(0,0,0,.54);transform:translateZ(0);opacity:0;transition:all .5s cubic-bezier(.35,0,.25,1)}.md-backdrop.md-active{opacity:1;pointer-events:auto}.md-backdrop.md-transparent{background:none}