#let poem(content) = {
  set par(first-line-indent: 0em)

  align(center, block[
    #set align(left)
    #set block(breakable: false)
    #content
  ])
}

#poem[
  #block[
    “Humpty Dumpty sat on a wall: \
    Humpty Dumpty had a great fall. \
    All the King's horses and all the King's men \
    Couldn't put Humpty Dumpty in his place again.”
  ]
]