Show yes or no text in new tinder x card example

How do you show the yes or no text in the example ionic posted today, http://codepen.io/ionic/pen/nxEdH

Change the opacity for classes .yes-text, no-text{} from 0 to 10 within the css

I only want those classes to show when swipe partial. Like how tinder has. It looks like they have all the code there, but for some reason is turned off.

Any updates ton this ?

Thx,

Check out the /Overlay styling/ section of the css in this tutorial: https://blog.nraboy.com/2015/01/making-tinder-style-swipe-cards-ionic-framework/