Examine source code of Heart Theme

{
  "name": "Heart Theme",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "heart.svg"
    },
    "colors": {
      "frame": "rgba(235, 18, 44, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(244, 245, 226, 1)",
      "toolbar_field": "rgba(250, 3, 40, 1)"
    }
  }
}