.splash {
  background-image: radial-gradient(circle farthest-corner at center, #ffffff 0%, #ffffff 100%);
  margin: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-right: -50%;
  transform: translate(-50%, -50%);
}

.book {
  top: 50%;
  transform: translateY(-50%);
  position: relative;
  margin: 0 auto;
  border: 5px solid #f32e9e;
  width: 100px;
  height: 60px;
}
.book__page {
  position: absolute;
  left: 50%;
  top: -5px;
  margin: 0 auto;
  border-top: 5px solid #f32e9e;
  border-bottom: 5px solid #f32e9e;
  border-right: 5px solid #f32e9e;
  background: #ffffff;
  width: 50px;
  height: 60px;
  transform-origin: 0% 50%;
  animation: flip 1.2s infinite linear;
  animation-fill-mode: forwards;
}
.book__page:nth-child(1) {
  z-index: -1;
  animation-delay: 0.2s;
}
.book__page:nth-child(2) {
  z-index: -2;
  animation-delay: 0.4s;
}
.book__page:nth-child(3) {
  z-index: -3;
  animation-delay: 0.6s;
}

@keyframes flip {
  0% {
    transform: perspective(600px) rotateY(-0deg);
  }

  20% {
    background: #ffffff;
  }

  29.9% {
    background: #f0f0f0;
  }
  30% {
    transform: perspective(200px) rotateY(-90deg);
    background: #ffffff;
  }

  54.999% {
    opacity: 1;
  }
  55% {
    opacity: 0;
  }

  60% {
    transform: perspective(200px) rotateY(-180deg);
    background: #ffffff;
  }

  100% {
    transform: perspective(200px) rotateY(-180deg);
    background: #ffffff;
  }
}