Safari accent button color wrong

I'm writing an application that uses MDL and have reached the point where I am trying to get cross browser support. I've noticed that buttons with class `mdl-button--accent` and an icon inside have a strange effect on the color in Safari.

This is my version of safari :

This is what it looks like in the application:

I'm using the default MDL color scheme here and the buttons should all be pink (accent color).

here is a codepen where you can try it [http://codepen.io/kriddy800/pen/ZbmJjo](http://codepen.io/kriddy800/pen/ZbmJjo)

and in this zip is a video showing how to reproduce the issue on the code pen
[Record.zip](https://github.com/google/material-design-lite/files/298064/Record.zip)

You'll notice after clicking off the highlight that the button flickers a blue color.

Any input would be appreciated, thanks