<a class="btn animation COLOUR">Button animation</a>
<a class="btn animation-bounce COLOUR">Button bounce animation</a>
<a class="btn COLOUR">Button</a>
<a class="btn COLOUR-flat">Button flat</a>
<a class="btn COLOUR-flat-nodark">Button flat no dark</a>
<a class="btn COLOUR-nodark">Button nodark</a>
<a class="btn COLOUR-border">Button border</a>
<a class="btn COLOUR-border-nodark">Button border no dark</a>
<a class="btn animation hover COLOUR">Button animation and hover</a>
<a class="btn hover COLOUR">Button hover</a>
<a class="btn hover-scale COLOUR">Button scale hover</a>
<a class="btn hover-scale-inset COLOUR">Button scale inset hover</a>
<a class="btn hover-bounce COLOUR">Button bounce animation</a>
<button class="COLOUR">Button</button>

Preview

Button animation Button bounce animation Button Button flat Button flat no dark Button nodark Button border Button border no dark Button animation and hover Button hover Button scale hover Button scale inset hover Button bounce hover