Examine source code of Simple - Gray - Grid

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#e0e0e0",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Simple - Gray - Grid",
  "manifest_version": 2,
  "description": "<b>Simple Designs By BiscuitJunkie</b>\nEasy on the eye, friendly with surrounding buttons &amp; tabs.\nSame colour as the Office 2013 Dark Gray theme."
}