Global content above back to top button

Hi Tom,

Apologies for so many questions recently. I was trying to customize a little bit.

I'd like to add another button right above the back to top button. This button is email us. I added below

<div style="background: red;font-family:arial; position: fixed; bottom: 70px; right: 30px; width: 40px; line-height: 40px; text-align: center; border-radius: 3px;">	
	 
   <a href="mailto:interpreterdatabase.com@gmail.com">Email Us</a>

	</div>

The color red is just for testing thought. Will be either same as back to top background color or similar.

My questions is: I added the above code to a specific page using the editor and that allows it to appear on that page only. How can I make that button global please? (appear on every page just like the back to top button.)

I think in this way it would be easier for visitors to contact us on mobile devices.

Thank you
Leon