vars:
  - name: title
    required: true
  - name: subtitle
    required: false
    default: ""

elements:
  - type: text
    box: [1, 2, 8, 1]
    content: "{title}"
    font:
      size: 44
      bold: true
      align: center

  - type: text
    box: [1, 3.5, 8, 0.5]
    content: "{subtitle}"
    visible: "{subtitle != ''}"
    font:
      size: 24
      align: center