If the screen is just black or you can't see anything, you must change these settings in-game: Turn OFF Smooth Lighting

texture pack, but it's possible you're looking for a working download or instructions on how to set it up.

For Eaglercraft (a browser-based Minecraft clone typically running version 1.8.8), "fixed" X-ray texture packs are essential because standard Minecraft resource packs often fail to render correctly in browser environments, showing black boxes or missing textures Top Fixed X-Ray Packs for Eaglercraft

Click "Add Pack" or drag and drop the .zip file directly into the browser window.