.-z-1 {
    z-index: $z-index-1 !important;
}
.-z-2 {
    z-index: $z-index-2 !important;
}
.-z-3 {
    z-index: $z-index-3 !important;
}
.-z-4 {
    z-index: $z-index-4 !important;
}
.-z-5 {
    z-index: $z-index-5 !important;
}
.-z-6 {
    z-index: $z-index-6 !important;
}
.-z-7 {
    z-index: $z-index-7 !important;
}
.-z-8 {
    z-index: $z-index-8 !important;
}
.-z-9 {
    z-index: $z-index-9 !important;
}
.-z-neg {
    z-index: $z-index-neg !important;
}