One of Material Design's most appealing characteristics is the way elements move. Having content slide in and out of view allows us to manage data in a way that keeps the interface as uncomplicated as possible, while allowing users to access deeper content as and when they choose.
<a class="btn waves-effect">OK</a>
waves-light waves-red waves-yellow waves-orange waves-purple waves-green waves-teal
They are implemented as shown here:
<a class="btn waves-effect waves-purple">OK</a>
These colors are fine for very many purposes, but creating our own custom waves is very simple...