Waves

Waves is a javascript library which adds a nice effect to buttons when you click them.

<button type="button" class="btn btn-success btn-lg">Primary</button>
<button type="button" class="btn btn-danger btn-lg">Secondary</button>

<button type="button" class="btn btn-outline-success btn-lg">Primary outline</button>
<button type="button" class="btn btn-outline-danger btn-lg">Secondary outline</button>