* { box-sizing:border-box; }

 .reveal .slides section { height:100%; padding:0; background-size:contain; background-repeat:no-repeat; background-position:center; }

 .reveal .reveal-element .reveal-element-shape { position:absolute; left:0; top:0; width:100%; height:100%; }

 .reveal .reveal-element .reveal-element-image-wrapper { background-size:100% 100%; height:100%; }

 .reveal .reveal-element .reveal-element-image-wrapper .reveal-element-image { -webkit-user-drag:none; max-width:100%; max-height:100%; visibility:hidden; }

 .reveal .reveal-element .reveal-element-video { width:100%; }

 .reveal ul,.reveal ul ul { margin:0 0 0 1rem; padding:0 0 0 2rem; }