.#{$prefix}mask { z-index: 100; position: absolute; width: 100%; height: 100%; zoom: 1; } @if $include-ie { .#{$prefix}mask-shim { z-index: 100; position: absolute; top: 0; left: 0; width: 100%; height: 100%; } } .#{$prefix}mask-msg { z-index: 20001; position: absolute; }