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

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

#poem[
  #block[
    “'Tis the voice of the Lobster; I heard him declare, \
    “You have baked me too brown, I must sugar my hair.” \
    As a duck with its eyelids, so he with his nose \
    Trims his belt and his buttons, and turns out his toes.”
  ]

  #block[
    [later editions continued as follows \
    When the sands are all dry, he is gay as a lark, \
    And will talk in contemptuous tones of the Shark, \
    But, when the tide rises and sharks are around, \
    His voice has a timid and tremulous sound.]
  ]
]