theme.json for Custom Color Palette

theme.json

{
  "version": 1,
  "settings": {
    "color": {
      "custom": false,
      "customGradient": false,
      "gradients": [],
      "link": false,
      "palette": [
        {
          "slug": "speckyblue",
          "color": "#4f78a4"
        },
        {
          "slug": "superdark",
          "color": "#222222"
        },
        {
          "slug": "mediumdark",
          "color": "#333333"
        },
        {
          "slug": "white",
          "color": "#ffffff"
        }
      ]
    },
    "spacing": {
      "customPadding": false,
      "units": [
        "px",
        "em",
        "rem",
        "vh",
        "vw"
      ]
    },
    "typography": {
      "customFontSize": false,
      "customLineHeight": false,
      "dropCap": false,
      "fontSizes": []
    }
  }
}