message: art: elargie l'overlay sur mobile
diff: }
  #overlayContent {
  background: white;
  + top: 0;
  + left: 0;
  + bottom: 0;
  + right: 0;
  + margin: 1em;
  +
  + border-radius: 0.3em;
  + border: 2px solid #333350;
  position: fixed;
  + min-height: 6em;
  +}
  +
  +@media (min-width: 600px) {
  + #overlayContent {
  + width: 70%;
  + transform: translateX(-50%) translateY(-50%);
  top: 50%;
  left: 50%;
  - transform: translateX(-50%) translateY(-50%);
  - width: 70%;
  max-width: 40em;
  - border: 2px solid #333350;
  - margin: 1em;
  - padding: 0em 1.5em;
  - min-height: 6em;
  - border-radius: 0.3em;
  + }
  }
  