Default Bootstrap Background Colors
.bg-primary
.bg-secondary
.bg-success
.bg-danger
.bg-warning
.bg-info
.bg-light
.bg-dark
.bg-white
.bg-transparent
Custom Background Based on WHITE
.bg-white
.bg-white-9
.bg-white-8
.bg-white-7
.bg-white-6
.bg-white-5
.bg-white-4
.bg-white-3
.bg-white-2
.bg-white-1
.bg-transparent
Custom Background Based on BLACK
.bg-grey
.bg-grey-lighter
.bg-grey-lightest
.bg-dark
.bg-dark-lighter
.bg-dark-lightest
.bg-black
.bg-black-9
.bg-black-8
.bg-black-7
.bg-black-6
.bg-black-5
.bg-black-4
.bg-black-3
.bg-black-2
.bg-black-1
