Background Color - Primary Theme Color
<div class="bg-primary">your content</div>Background Color - Secondary Theme Color
<div class="bg-secondary">your content</div>Background Color - Theme Dark Color
<div class="bg-dark">your content</div>Background Color - Theme Light Color
<div class="bg-light">your content</div>Black Background
<div class="bg-black">your content</div>White Background
<div class="bg-white">your content</div>