<button class="btn btn-primary mb1 bg-blue">Button</button>
<button class="btn btn-primary mb1 bg-black">Button</button>
<button class="btn btn-primary mb1 black bg-gray">Button</button>
<button class="btn btn-primary mb1 black bg-silver">Button</button>
<button class="btn btn-primary mb1 black bg-aqua">Button</button>
<button class="btn btn-primary mb1 bg-navy">Button</button>
<button class="btn btn-primary mb1 bg-teal">Button</button>
<button class="btn btn-primary mb1 bg-green">Button</button>
<button class="btn btn-primary mb1 bg-olive">Button</button>
<button class="btn btn-primary mb1 bg-lime">Button</button>
<button class="btn btn-primary mb1 black bg-yellow">Button</button>
<button class="btn btn-primary mb1 bg-orange">Button</button>
<button class="btn btn-primary mb1 bg-red">Button</button>
<button class="btn btn-primary mb1 bg-fuchsia">Button</button>
<button class="btn btn-primary mb1 bg-purple">Button</button>
<button class="btn btn-primary mb1 bg-maroon">Button</button>
<button class="btn btn-primary mb1 black bg-darken-1">Button</button>
<button class="btn btn-primary mb1 black bg-darken-2">Button</button>
<button class="btn btn-primary mb1 black bg-darken-3">Button</button>
<button class="btn btn-primary mb1 black bg-darken-4">Button</button>