배경 (background)

bg-primary

bg-success

bg-warning

bg-danger

bg-secondary

bg-info

bg-dark

bg-light

<div class="bg-primary">
	bg-primary
</div>
<div class="bg-success">
	bg-success
</div>
<div class="bg-warning">
	bg-warning
</div>
<div class="bg-danger">
	bg-danger
</div>
<div class="bg-secondary">
	bg-secondary
</div>
<div class="bg-info">
	bg-info
</div>
<div class="bg-dark">
	bg-dark
</div>
<div class="bg-light">
	bg-light
</div>

투명 배경

bg-transparent

<div class="bg-transparent">
	bg-transparent
</div>