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

  align(center, block[
    #set align(center)
    #set block(breakable: false)
    #scale(x: -100%)[#content]
  ])
}

#poem[
  #block[
    #smallcaps[Jabberwocky.]
    #set align(left)
    #emph[
      'Twas brillig, and the slithy toves \
      #h(1em)Did gyre and gimble in the wabe; \
      All mimsy were the borogoves, \
      #h(2em)And the mome raths outgrabe.
    ]
  ]
]