body {
  height: 100%;
  margin: 0;
  padding: 0;
  height: 100vh;
  background-image: url('bg3.png');
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
  display: flex;
  justify-content: center;
  align-items: center;
}

#boite {
  text-align: center;
  z-index: 2;
}

#btn1{
  border-radius: 50%;
}
.panneau {
  position: relative;
  display: none;
  z-index: 3;
  border-radius: 50%;


}
#paneau1 {
  left: 240px;
  top: 20px;
  width: 80px;
  height: 50px;

}

#paneau2 {
  left: 310px;
  top: 30px;
  width: 100px;
  height: 50px;
}

#paneau3 {
  right: 400px;
  bottom: 0px;
  width: 100px;
  height: 50px;
}
  
#texte {
  opacity: 0;
  transition: opacity 2s ease-in-out;
  font-size: 24px;
  margin-bottom: 20px;
  color: white;
}

#texte.visible {
  opacity: 1;
}