x: {
  grid-columns: 2

  a.width: 50
  a.height: 72
  b.width: 50
  b.height: 30
}

y: {
  grid-columns: 2

  a.width: 50
  a.height: 73
  b.width: 50
  b.height: 30
}

z: {
  grid-columns: 2
  lim: |latex
    \lim_{h \rightarrow 0 } \frac{f(x+h)-f(x)}{h}
  |
  add: |latex
    1 + 1
  |
}