HTML How to turn a link into a button : 	<a href="#">
				<div class="col-md-4 promo-item item-1">
					<h3>
						Unleash
					</h3>
				</div>
            </a>

I got a template online, the above (with css/bootstrap?), is an image that is a link. I want to change it so that instead of a link (href), its a clickable button.

My plan is for the button to use javascript to change some of the content on the page, basing it off the javascript below;

    <button type="button" onclick="document.getElementById('demo').innerHTML='Hello JavaScript!' ">Click Me!</button>

So how do i change this href into a button??