Examine source code of Very bright..

{
  "theme": {
    "images": {
      "theme_frame": "0527-aorenjinosora.jpg"
    },
    "colors": {
      "frame": "#f5dcdc",
      "tab_background_text": "#c7e6f5"
    }
  },
  "version": "2.0",
  "name": "Very bright..",
  "manifest_version": 2,
  "description": "とてもあかるく。。\n\n\n\n0527-aorenjinosora●"
}