body {
  margin: 0;
  background: #f3e9df;
}

.book {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  overflow: hidden;
}

* {
  box-sizing: border-box;
}

.page img {
  display: block;
  width: 100%;
  height: auto;
}

.page {
  position: relative;
}

.overlay-button {
  position: absolute;
  display: block;
  z-index: 9999;
}

/* BOUTON MINI */

.mini-button {
  left: 25%;
  top: 40%;
  width: 50%;
  height:20%;
  z-index: 9999;
}

/* BOUTON MAIL */

.mail-button {
  left: 12%;
  top: 52%;
  width: 32%;
  height: 10%;
  z-index: 9999;
}

/* BOUTON INSTAGRAM */

.instagram-button {
  left: 56%;
  top: 52%;
  width: 32%;
  height: 10%;
  z-index: 9999;
}

/* CURIOSITÉS */

.curiosites-button {
  left: 35%;
  top: 30%;
  width: 30%;
  height: 10%;

}

/* FAUNE & FLORE */

.faune-button {
  left: 35%;
  top: 45%;
  width: 30%;
  height: 10%;

}

/* ORNEMENTAL */

.ornemental-button {
  left: 35%;
  top: 60%;
  width: 30%;
  height: 10%;

}

@media screen and (max-width: 768px) {

  .book {
    max-width: 100%;
  }

  .page img {
    width: 100%;
    height: auto;
  }

}

.back-to-top {
  position: fixed;
  right: 16px;
  bottom: 16px;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: #111111;
  color: #f3e9df;
  font-size: 28px;
  line-height: 40px;
  text-align: center;
  z-index: 10000;
  opacity: 0.8;
}
img {
  user-select: none;
  -webkit-user-drag: none;
}
img {
  user-select: none;
  -webkit-user-select: none;
  -webkit-user-drag: none;
  -webkit-touch-callout: none;
  pointer-events: none;
}