jquery-mobile-menu-plugin/dist/extensions/popup/jquery.mmenu.popup.css

The best jQuery plugin for app look-alike on- and off-canvas menus with sliding submenus for your website and webapp.

.mm-menu.mm-popup{transition:opacity .4s ease;opacity:0;box-shadow:0 2px 10px rgba(0,0,0,.3);height:80%;min-height:140px;max-height:880px;top:50%;left:50%;bottom:auto;right:auto;-webkit-transform:translate3d(-50%,-50%,0);transform:translate3d(-50%,-50%,0)}
html.mm-popup.mm-opening .mm-menu.mm-popup{opacity:1}
html.mm-popup .mm-slideout{-webkit-transform:none!important;transform:none!important;z-index:0}
html.mm-popup #mm-blocker{transition-delay:0s!important;z-index:1}
html.mm-popup .mm-menu{z-index:2}