Project: selector
Task (easy): - append an element <p> with arbitrary text, class `class1` and id `id1` to `.root`
- write css to the page with:
  - type selector to set its `padding` to `5px`
  - class selector to set its `text-decoration` to `underline`
  - id selector to set its `font-family` to `monospace`
- no js, modify html file directly