The image looks blurry on macbook retina

[thehappycoder]

First of all, I want to say thank you for this wonderful plugin. I like it the most from the others I found here http://webdesignandsuch.com/10-jquery-back-to-top-link-solutions-for-websites/

There is a small problem. When I open the image on my computer, it looks small but not blurry but on the page it's bigger and blurry.

[sambodhiprem]

I use a vector image (.svg) instead of a png, see here: http://goo.gl/pGTey Not sure if this will make a difference, but might be worth a try.