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html

css

html {
  height: 100%;
  overflow: hidden;
}

body {
  min-height: 100%;
}

.container {
  cursor: pointer;
  background-position: center center;
  background-size: cover;
  background-image: url("https://images.unsplash.com/photo-1621295693450-080546d2ec8e?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYyMTYyOTMxMA&ixlib=rb-1.2.1&q=80&w=1800");
  width: 100vw;
  height: 100vh;
  position: relative;
}

.container:focus {
  display: none;
}

.flap {
  width: 150vmax;
  height: 150vmax;
  position: absolute;
  bottom: 50%;
  right: 50%;
  pointer-events: none;
  will-change: transform;
  background: hsl(calc(1turn * var(--p)), 80%, 80%);
  background: linear-gradient(35deg, #555, black);
  border: solid 4px #999;
  --p: calc(var(--i) / var(--flaps));
  -webkit-animation: click 0.9s cubic-bezier(0.5, 0, 0.5, 1) 0.1s;
          animation: click 0.9s cubic-bezier(0.5, 0, 0.5, 1) 0.1s;
  transform-origin: bottom right;
  transform: rotate(-0.5turn) rotate(calc(1turn * var(--p))) skewX(30deg) translateX(-100%) translateY(90%);
}
@-webkit-keyframes click {
  48%, 52% {
    transform: rotate(-0.25turn) rotate(calc(1turn * var(--p))) skewX(30deg) translateX(0%) translateY(0%);
  }
}
@keyframes click {
  48%, 52% {
    transform: rotate(-0.25turn) rotate(calc(1turn * var(--p))) skewX(30deg) translateX(0%) translateY(0%);
  }
}

.photo {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-position: center center;
  background-size: cover;
  box-shadow: 0 10px 40px #000;
  margin: -1rem;
  margin-bottom: -5rem;
  border: solid 1rem #fff;
  border-bottom-width: 5rem;
  -webkit-animation: photo 5s cubic-bezier(0.5, 0, 0.5, 1) 0.9s both;
          animation: photo 5s cubic-bezier(0.5, 0, 0.5, 1) 0.9s both;
}
@-webkit-keyframes photo {
  30%, 60%, 70% {
    filter: sepia(30%) saturate(140%) contrast(120%);
    transform: scale(0.5) rotate(-4deg);
  }
  61% {
    opacity: 1;
  }
  71% {
    opacity: 0;
    transform: none;
  }
  100% {
    filter: none;
    opacity: 1;
  }
}
@keyframes photo {
  30%, 60%, 70% {
    filter: sepia(30%) saturate(140%) contrast(120%);
    transform: scale(0.5) rotate(-4deg);
  }
  61% {
    opacity: 1;
  }
  71% {
    opacity: 0;
    transform: none;
  }
  100% {
    filter: none;
    opacity: 1;
  }
}

.instructions {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  padding: 1rem;
  font-family: monospace;
  text-transform: uppercase;
  text-shadow: 0 1px 8px #fff;
}

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