Examine source code of Guild Wars 2 red shadows

{
  "theme": {
    "images": {
      "theme_frame": "gw2personal.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Guild Wars 2  red shadows",
  "manifest_version": 2,
  "description": "It´s my first persona and I just have make Guild Wars 2 picture as shadow on a red background"
}