HTML

html email signature code

<a href="maito:youremail@gmail.com"><button>email me!</button></a>
or
<button onclick="document.location = 'maito:youremail@gmail.com'"></button>

NOTE:
you can always replace <button> with a text element like <p> or <h1>. I reccomend
  the first line of code if you are unsure of which one you should use.
  

html email signature

<a href="maito:youremail@gmail.com">Send email!</a>

html email signature tutorial

<p> <a href ="mailto: example@gmail.com" > You can mail to anyone </a> </p>