.mainDiv {
  position: relative;

  @media (orientation: portrait) {
    @media only screen and (max-width: 820px) {
      padding: unset !important;
    }
  }
  @media (orientation: landscape) {
    @media only screen and (max-width: 1200px) {
      padding-top: unset !important;
    }
  }
}

.imageWelcomeJeuConcours {
  display: block;
  width: 90%;
  margin: auto;
  content: url('./assets/construction.jpg');

  @media (orientation: portrait) {
    @media only screen and (max-width: 820px) {
      content: url('./assets/construction_mobile.jpg');
      width: 100%;
    }
  }

  @media (orientation: landscape) {
    @media only screen and (max-width: 1200px) {
      content: url('./assets/construction.jpg');
      width: 100%;
    }
  }
}