Examine source code of 1st try

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "typical",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(32, 38, 41)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(32, 38, 41)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(54, 58, 89)",
      "toolbar_field_text": "rgb(237, 237, 237)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(255, 255, 255)",
      "ntp_text": "rgb(217, 18, 21)",
      "tab_background_separator": "rgb(252, 12, 12)",
      "tab_selected": "rgb(255, 255, 255)",
      "tab_text": "rgb(0, 0, 0)",
      "toolbar_field_border": "rgb(221, 141, 234)",
      "toolbar_field_highlight": "rgba(33, 115, 130, 0.66)",
      "toolbar_top_separator": "rgba(211, 27, 27, 0)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  }
}