For z-index: {value} use the shorthand class .z-{value}.
| Style | Class |
z-index: -1; |
.z--1 |
z-index: 0; |
.z-0 |
z-index: 10; |
.z-10 |
z-index: 20; |
.z-20 |
z-index: 30; |
.z-30 |
z-index: 40; |
.z-40 |
z-index: 50; |
.z-50 |
z-index: 100; |
.z-100 |
z-index: 1000; |
.z-1000 |
z-index: 10000; |
.z-10000 |
z-index: auto; |
.z-auto |