Bar Chart with Color Palette

spec.json

{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "description": "A bar chart showing the US population distribution of age groups and gender in 2000.",
  "data": {"url": "data/population.json"},
  "transform": [
    {"filter": "datum.year == 2000"},
    {"calculate": "datum.sex == 2 ? 'Female' : 'Male'", "as": "gender"}
  ],
  "width": {"step": 17},
  "mark": "bar",
  "encoding": {
    "x": {"field": "age", "type": "ordinal"},
    "y": {
      "aggregate": "sum",
      "field": "people",
      "title": "population",
      "stack": null
    },
    "color": {
      "field": "age",
      "scale": {
        "range": [
          "#1a73e8",
          "#12b5cb",
          "#e52592",
          "#e8710a",
          "#f9ab00",
          "#7cb342"
        ]
      }
    },
    "opacity": {"value": 0.7}
  }
}