:root { // z-index --z-index-minus: -1; --z-index-zero: 0; --z-index-one: 1; --z-index-low: 10; --z-index-twenty: 20; --z-index-normal: 100; --z-index-high: 1000; --z-index-higher: 2000; --z-index-much-higher: 5000; --z-index-very-high: 9999; --z-index-highest: 10000; }