message: art: corige le style sur mobile
diff: .step input.suffixed {
  padding: 0.1em 1em 0;
  + margin: 0.6rem 0;
  border-radius: 0.2em;
  font-size: 120%;
  }
  .answer {
  display: flex;
  + flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
  }
  