title: Angular Material mat-ripple isn't working
body: <p>I'm trying to add ripple effect to one button, but it crashes whole webpage. 
  When I just add <code>matRipple</code> to my button nothing happens. When I try to add color <code>[matRippleColor]="white"</code> I get <strong>"Can't bind to 'matRippleColor' since it isn't a known property of 'button'"</strong>.</p>
  
  <p>That strange because I enabled ripples on other page of website and it works just fine. (So yes, I've imported MatRippleModule):<a href="https://i.stack.imgur.com/QYZ0r.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QYZ0r.jpg" alt="enter image description here"></a></p>
  
  <p>HTML:</p>
  
  <pre><code>&lt;button  matRipple class="submit-button" color="accent" type="submit" &gt;
    &lt;mat-icon&gt;search&lt;/mat-icon&gt;&lt;span&gt;Szukaj&lt;/span&gt;
  &lt;/button&gt;
  </code></pre>