[Theme: Colormag] How can i get a scroll to bottom button?

So the theme i’m using is colormag. I already have a smooth scroll to top button on the bottom of the page floating, but im trying to get a scroll to bottom button, and place it on my nav bar.

Here’s my site’s layout: http://imgur.com/GDCO7Ff

I’m trying to just have a navigation item beside “tip us” with an arrow pointing down that when you click, will send you to the bottom of the site, all the way to the footer. Here’s my site for your reference: http://www.droidfeed.net