Image won't center

Howdy,

On this page: http://erin.heartcorecreative.com I can not seem to get the button "click here to learn more" centred.

This is code I have:
<img class="aligncenter wp-image-1358 size-full" src="http://erin.heartcorecreative.com/wp-content/uploads/2016/06/CLICK-HERE.png" alt="CLICK-HERE" width="300" height="64" />

Thanks in advance,
Casper