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

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

#poem[
  #block[
    “I sent a message to the fish: \
    I told them ‘This is what I wish.'
  ]

  #block[
    The little fishes of the sea, \
    They sent an answer back to me.
  ]

  #block[
    The little fishes' answer was \
    ‘We cannot do it, Sir, because---'”
  ]
]