message: art: Alignement du titre et de la conversation
diff: #sim {
  - padding: 3em 0; /* For the warning message */
  + margin: 1% auto;
  /*background-image: radial-gradient(ellipse at center, white -160%, rgba(255,255,255,0) 100%);*/
  /*background-image: radial-gradient(ellipse at center, #4A89DC -160%,#333350 70%);*/
  color: #333350;
  height: 100%;
  padding-bottom: 10%;
  + padding: 1em;
  + max-width: 50em;
  +
  }
  #sim p {
  #sim > h1 {
  color: inherit;
  - margin-top: 0;
  - text-align: center;
  + margin: 0;
  font-size: 350%;
  font-weight: 800;
  }
  #simSubtitle {
  margin-top: -.5em;
  - text-align: center;
  font-size: 120%;
  font-weight: 300;
  margin-bottom: 2.5em;
  #sim .intro {
  font-style: italic;
  font-size: 110%;
  - width: 50em;
  - max-width: 90%;
  - margin: 0 auto;
  }
  #sim .intro > div {
  margin: 1em 0;
  #conversation {
  - margin: 3em auto;
  - padding: 0 1em;
  + margin-top: 6%;
  font-size: 110%;
  line-height: normal;
  min-height: 10em;
  - max-width: 50em;
  }
  