Examine source code of Material Spacegray

{
  "name": "Material Spacegray",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "Screen Shot 2018-11-15 at 10.25.49 AM.png"
    },
    "colors": {
      "toolbar": "rgba(49, 49, 49, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(93, 109, 120, 1)",
      "frame": "rgba(49, 49, 49, 1)",
      "tab_background_text": "rgba(93, 109, 120, 1)",
      "bookmark_text": "rgba(153, 202, 195, 1)"
    }
  }
}