$z-index-1: 1000; $z-index-2: 2000; $z-index-3: 3000; $z-index-4: 4000; $z-index-5: 5000; $z-index-6: 6000; $z-index-7: 7000; $z-index-8: 8000; $z-index-9: 9000;