Sprite image not appearing in Android App

Hello, i’m using ion-slides to show a basic tutorial of my App. So, i’m using some elements that are in a image and to show a part of image i’m using the sprite technique . I did the page based in my browser view and the final style in browser was:

However, i built the .apk (Android) and ran the App and the images didn’t apper. Can someone help me? I googled but didn’t find anything. Here is my CSS and .html that i wrote: pastebin

Waiting for replies, Lucas.