Examine source code of Pico-8

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Pico-8",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-004-5adbf39566f69f1540a711c43ceb45fc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(255, 0, 77)",
      "toolbar_text": "rgb(255, 204, 170)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 241, 232)",
      "toolbar_field": "rgb(29, 43, 83)",
      "toolbar_field_text": "rgb(194, 195, 199)",
      "tab_line": "rgb(255, 204, 170)",
      "popup": "rgb(29, 43, 83)",
      "popup_text": "rgb(255, 241, 232)",
      "ntp_background": "rgb(29, 43, 83)",
      "ntp_text": "rgb(194, 195, 199)",
      "tab_loading": "rgb(255, 204, 170)"
    }
  }
}