body,
p {
  margin: 0;
}

header {
  padding-top: 10px;
  flex-grow: 1;
  font-size: 1.6rem;
  margin: auto;
}

header > p {
  width: fit-content;
  background-color: rgba(255, 255, 255, 0.8);
  padding: 2px 5px;
}

.hints {
  font-size: small;
}

.hidden {
  visibility: hidden;
}

.container {
  height: 100vh;
  width: 100%;
  background-position: center;
  text-align: center;
  display: flex;
  flex-direction: column;

  animation-name: animate;
  animation-direction: alternate;
  animation-duration: 30s;
  animation-fill-mode: forwards;
  animation-iteration-count: infinite;
  animation-play-state: running;
  animation-timing-function: ease-in-out;
}

.container.secret {
  animation-name: secretAnim;
}

@keyframes secretAnim {
  0% {
    background-image: url("https://i.ibb.co/fk9ZN3P/14des21frame1.jpg");
  }
  25% {
    background-image: url("https://i.ibb.co/LgJbZtZ/nabicho1.jpg");
  }
  50% {
    background-image: url("https://i.ibb.co/93ZFFRt/nyap1.jpg");
  }
  75% {
    background-image: url("https://i.ibb.co/RbRDjhB/nabicho2.jpg");
  }
  100% {
    background-image: url("https://i.ibb.co/6RRj5fK/nyap2.jpg");
  }
}

@keyframes animate {
  0% {
    background-image: url("https://picsum.photos/1920/1080?random=1");
  }
  25% {
    background-image: url("https://picsum.photos/1920/1080?random=2");
  }
  50% {
    background-image: url("https://picsum.photos/1920/1080?random=3");
  }
  75% {
    background-image: url("https://picsum.photos/1920/1080?random=4");
  }
  100% {
    background-image: url("https://picsum.photos/1920/1080?random=5");
  }
}