Examine source code of dark soft contrast

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "dark soft",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-005-f5f3cf677b1f132c75ddc7bd319dd1fc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(6, 17, 22)",
      "toolbar_text": "rgb(242, 247, 247)",
      "frame": "rgb(19, 49, 63)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(0, 11, 7)",
      "toolbar_field_text": "rgb(253, 253, 253)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(19, 49, 63)",
      "popup_text": "rgb(251, 251, 251)",
      "button_background_hover": "rgb(99, 133, 151)",
      "popup_border": "rgb(19, 49, 63)",
      "tab_selected": "rgb(99, 133, 151)",
      "toolbar_field_focus": "rgb(19, 49, 63)",
      "toolbar_top_separator": "rgb(3, 0, 26)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  }
}