theme.json

{
  "$schema": "https://schemas.wp.org/trunk/theme.json",
  "version": 2,
  "settings": {
    "appearanceTools": true,
    "color": {
      "defaultPalette": false,
      "background": false,
      "palette": [
        {
          "name": "Black",
          "slug": "black",
          "color": "#000000"
        }
      ]
    },
    "custom": {
      
    },
    "typography": {
			"fontSizes": [
				{
					"slug": "small",
					"size": "1rem",
					"name": "Small"
				},
				{
					"slug": "medium",
					"size": "1.2rem",
					"name": "medium"
				},
				{
					"slug": "large",
					"size": "1.5rem",
					"name": "large"
				}
			]
    },
		"layout": {
			"contentSize": "840px",
			"wideSize": "1100px",
      "allowEditing": true
		},
    "background": {
      "backgroundImage": true
    },
    "position": {
      "sticky": true
    },
		"spacing": {
      "customSpacingSize": false,
			"padding": true,
			"margin": true,
			"units": [ "em", "rem", "vh", "vw", "%" ],
      "spacingSizes": [
        {
          "name": "Step 1",
          "size": "0.25rem",
          "slug": "10"
        },
        {
          "name": "Step 2",
          "size": "0.5rem",
          "slug": "20"
        },
        {
          "name": "Step 3",
          "size": "0.75rem",
          "slug": "30"
        },
        {
          "name": "Step 4",
          "size": "1rem",
          "slug": "40"
        },
        {
          "name": "Step 5",
          "size": "1.25rem",
          "slug": "50"
        }
      ]
		}
  },
  "styles": {
    "color": {
      "background":"var(--wp--preset--color--white)",
      "text":"var(--wp--preset--color--black)"
    },
    "typography":{
      "fontSize":"1.5rem",
      "fontFamily":"var(--wp--preset--font-family--system-fonts)",
      "lineHeight":"1.5"
    },
    "spacing":{
      "margin":{
        "top":"0px",
        "right":"0px",
        "bottom":"0px",
        "left":"0px"
      }
    }
  }
}