<div class="decoration">
  <div class="panel">
    <img class="cover" src="https://raw.githubusercontent.com/robole/artifice/main/christmas-decoration/img/cover.jpg" alt="christmas tree cover" />
  </div>
  <div class="panel">
    <img class="hat" src="https://raw.githubusercontent.com/robole/artifice/main/christmas-decoration/img/hat-reversed.png" alt="hat" />
  </div>
  <div class="panel">
    <img class="hat" src="https://raw.githubusercontent.com/robole/artifice/main/christmas-decoration/img/hat.png" alt="hat" />
  </div>
  <div class="panel">
    <img class="hat" src="https://raw.githubusercontent.com/robole/artifice/main/christmas-decoration/img/snowy-scene.jpg" alt="christmas tree cover" />
  </div>
</div>

/* Source code:
https://github.com/robole/artifice
*/

:root {
  --panel-width: 250px;
}

body {
  background-color: aquamarine;
}

.decoration {
  display: flex;
  perspective: 1500px;
  width: calc(2 * var(--panel-width));
  margin-top:8rem;
}

.cover {
  width: inherit;
  height: inherit;
  object-fit: cover;
  mask-image: url(https://raw.githubusercontent.com/robole/artifice/main/christmas-decoration/img/hat-mask.png);
  mask-mode: alpha;
  mask-size: cover;
  mask-repeat: no-repeat;
  mask-position: 50% 50%;
  -webkit-mask-image: url(https://raw.githubusercontent.com/robole/artifice/main/christmas-decoration/img/hat-mask.png);
  -webkit-mask-mode: alpha;
  -webkit-mask-size: cover;
  -webkit-mask-repeat: no-repeat;
  -webkit-mask-position: 50% 50%;
}

.panel {
  width: var(--panel-width);
  height: calc(var(--panel-width) * 1.25);
  transform-style: preserve-3d;
}

.panel:nth-child(1) {
  background-color: transparent;
  transform-origin: 100% center;
  transform: rotateY(40deg);
  z-index: 40;
  animation: fold 3s alternate infinite;
  animation-timing-function: ease-in-out;
}

.panel:nth-child(2) {
  background-color: rgb(241, 241, 241);
  border-left: 3px solid rgba(0, 0, 0, 0.2);
  border-right: 3px solid rgba(0, 0, 0, 0.1);
  transform-origin: 0% center;
  transform: rotateY(-40deg);
}

.panel:nth-child(3) {
  background-color: red;
  border-right: 3px solid rgba(0, 0, 0, 0.1);
  transform-origin: 100% center;
  transform: rotateY(27deg) translate3d(-98px, 0, 0);
}

.panel:nth-child(4) {
  background-color: transparent;
  border-left: 3px solid rgba(0, 0, 0, 0.2);
  transform-origin: 0% center;
  transform: rotateY(-23deg) translate3d(-66px, 0, 73px);
}

.hat {
  width: inherit;
  height: inherit;
  object-fit: cover;
  filter: drop-shadow(1px 1px rgba(0, 0, 0, 0.5));
}

@keyframes fold {
  80%,
  100% {
    transform: rotateY(140deg);
  }
}

// not today