<button class="button button--shadow" type="button">Button</button>
<!-- or -->
<button class="button button--shadow" type="submit">Submit button</button>
<!-- or -->
<input class="button button--shadow" type="button" value="Button input">
<!-- or -->
<input class="button button--shadow" type="submit" value="Submit input">
<!-- or -->
<a class="button button--shadow" href="#">Link</a>
<!-- or -->
<span class="button button--shadow">Faux button</span>