#accueil{
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url(../img/bgaccueil.png);
    background-repeat: no-repeat;
    background-size: cover;
}

#boutonaccueil{
    position: absolute;
    top: calc(50vh - 78px);
    right: 75px;
    cursor: pointer;
    animation: blinker 1.5s linear infinite;
}

@keyframes blinker {
    50% {
      opacity: 0.2;
    }
    100% {
        opacity: 1;
      }
  }