Examine source code of Mermaid Yukako Theme!

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Mermaid Yukako Theme! ",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(147, 174, 166)",
      "toolbar_text": "rgb(222, 255, 242)",
      "frame": "rgb(175, 225, 205)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(67, 127, 103)",
      "tab_line": "rgb(158, 244, 212)",
      "popup": "rgb(243, 255, 250)",
      "popup_text": "rgb(131, 169, 154)",
      "tab_loading": "rgb(158, 244, 212)"
    }
  }
}