{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "width": 300,
  "padding": 5,

  "scales": [
    {
      "name": "color",
      "type": "linear",
      "range": {"scheme": "viridis"},
      "domain": [0, 100]
    }
  ],

  "marks": [
    {
      "type": "rect",
      "encode": {
        "update": {
          "width": {"signal": "width"},
          "height": {"value": 15},
          "fill": {"gradient": "color"}
        }
      }
    },
    {
      "type": "rect",
      "encode": {
        "update": {
          "y": {"value": 20},
          "width": {"signal": "width"},
          "height": {"value": 15},
          "fill": {
            "value": {
              "gradient": "linear",
              "stops": [
                {"offset": 0.0, "color": "red"},
                {"offset": 0.5, "color": "white"},
                {"offset": 1.0, "color": "blue"}
              ]
            }
          }
        }
      }
    },
    {
      "type": "symbol",
      "encode": {
        "update": {
          "x": {"value": 25},
          "y": {"value": 62},
          "size": {"value": 1900},
          "fill": {
            "value": {
              "gradient": "radial",
              "stops": [
                {"offset": 0.0, "color": "red"},
                {"offset": 0.5, "color": "white"},
                {"offset": 1.0, "color": "blue"}
              ]
            }
          }
        }
      }
    },
    {
      "type": "rect",
      "encode": {
        "update": {
          "x": {"value": 100},
          "y": {"value": 40},
          "width": {"value": 200},
          "height": {"value": 45},
          "fill": {
            "value": {
              "gradient": "radial",
              "stops": [
                {"offset": 0.0, "color": "red"},
                {"offset": 0.5, "color": "white"},
                {"offset": 1.0, "color": "blue"}
              ]
            }
          }
        }
      }
    }
  ]
}