:root {
  --primary-color: dodgerblue;
  --secondary-color: linen;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  display: flex;
  min-height: 100vh;
  align-content: center;
  justify-content: center;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}

body {
  background-color: var(--secondary-color);
}

figure {
  display: flex;
  flex-direction: column;
  justify-content: center;
  perspective: 1000;
  -webkit-perspective: 1000;
  -moz-perspective: 1000;
}

img {
  display: block;
  height: auto;
  width: 100%;
  min-width: 280px;
  border-radius: 4.5rem;
}

.container {
  border-radius: 5rem;
  border: 0.5rem solid var(--primary-color);
  position: relative;
  transition: transform 0.5s ease;
  animation: image-rotate 10s ease 5s infinite;
  transform-style: preserve-3d;
}

.mask {
  position: absolute;
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
  border-radius: 4.5rem;
  opacity: 0.3;
  background-color: var(--primary-color);
}

figcaption {
  position: absolute;
  text-align: center;
  font-size: 2rem;
  line-height: 1;
  color: var(--primary-color);
  left: 50%;
  transform: rotateX(-90deg) translateX(-50%) translateY(25%);
  transform-style: preserve-3d;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

h1 {
  margin: 0;
}

@media screen and (prefers-color-scheme: dark) {
  :root {
    --secondary-color: #223;
  }
}

@keyframes image-rotate {
  0% {
    transform: rotateX(0deg);
  }

  10% {
    transform: rotateX(85deg);
  }

  20% {
    transform: rotateX(85deg);
  }

  30% {
    transform: rotateX(0deg);
  }
}