Examine source code of lightning-yellow

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "lightning-yellow",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-040-c7aacc9fe1f10843f8b1bd2b78b73b22.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(239, 239, 239)",
      "toolbar_text": "rgb(41, 42, 43)",
      "frame": "rgb(239, 239, 239)",
      "tab_background_text": "rgb(41, 42, 43)",
      "toolbar_field": "rgb(239, 239, 239)",
      "toolbar_field_text": "rgb(41, 42, 43)",
      "tab_line": "rgb(102, 56, 240)",
      "popup": "rgb(239, 239, 239)",
      "popup_text": "rgb(41, 42, 43)",
      "tab_loading": "rgb(102, 56, 240)"
    }
  }
}