message: art: Travail visuel sur les exemples de calcul
diff: +#exampleSituations ul {
  + margin-top: 1.5em;
  +}
  #exampleSituations .example {
  border-bottom: 1px solid #eee;
  width: 100%;
  display: flex;
  justify-items: space-between;
  + align-items: center;
  }
  #exampleSituations .example h2 {
  width: 30%;
  