Examine source code of Soft Theme

{
  "name": "Soft Theme",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "header no.4.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(79, 69, 69, 1)",
      "toolbar": "rgba(252, 216, 212, 1)",
      "bookmark_text": "rgba(79, 69, 69, 1)",
      "toolbar_field": "rgba(253, 246, 240, 1)",
      "toolbar_field_text": "rgba(79, 69, 69, 1)",
      "tab_line": "rgba(79, 69, 69, 1)"
    }
  }
}