#cadre-formule {
  width: 50%;
  padding:10px;
  border: 2px solid grey;
  margin: 20px;
}

#formule {
  color: orange;
  font-size: large;
}

#formule-exemple {
  color: DarkCyan;
  font-size: large;
}

.comment {
  font-style: italic;
  color: grey;
  font-size: small;
}