bootstrap之颜色对应class

1: 背景色class = 'bg-xxx'

.bg-red,
.bg-yellow,
.bg-aqua,
.bg-blue,
.bg-light-blue,
.bg-green,
.bg-navy,
.bg-teal,
.bg-olive,
.bg-lime,
.bg-orange,
.bg-fuchsia,
.bg-purple,
.bg-maroon,
.bg-black,
.bg-red-active,
.bg-yellow-active,
.bg-aqua-active,
.bg-blue-active,
.bg-light-blue-active,
.bg-green-active,
.bg-navy-active,
.bg-teal-active,
.bg-olive-active,
.bg-lime-active,
.bg-orange-active,
.bg-fuchsia-active,
.bg-purple-active,
.bg-maroon-active,
.bg-black-active