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Default

Standard button Example 
<button styling="button">Follow</button>

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Secondary

Button can be primary and secondary Example 
<button styling="button">Okay</button>
<button styling="button button-secondary">Cancel</button>

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Icon

Can be only icon Example 
<button styling="button">
  <widget:icon icon="heart"></widget:icon>
</button>

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Disabled

Example 
<button styling="disabled button">
    <i class="icon icon-head"></i>
    Disabled
</button>

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Size

Button are in different sizes Example 
<button styling="xs button">Extra Small</button>
<button styling="sm button">Small</button>
<button styling="md button">Medium</button>
<button styling="lg button">Large</button>
<button styling="xl button">Extra Large</button>

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Floated

Button can float to left or right Example 
<button styling="button pull-right">Right Floated</button>
<button styling="button pull-left">Left Floated</button>