:root {
    --unit: 1.6vmin;
    --width: calc(var(--unit) * 6);
    --height: calc(var(--unit) * 8);
}

ul,
li {
    position: absolute;
    width: var(--width);
    height: var(--height);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) var(--transform, translate(0, 0));
    transform-style: preserve-3d;
    z-index: -1;
}
li {
    background: hsl(calc(var(--i) * 360 / var(--t)), 100%, 53%);
    background: radial-gradient(
            circle,
            hsl(216, 88%, 86%) 22%,
            hsl(216, 88%, 26%) 22%
    )
    top center;
    background-size: calc(var(--unit) * 1.5) calc(var(--unit) * 1.5);
    --clip-path: polygon(0% 100%, 50% 0%, 100% 100%);
    --transform: rotateY(calc(var(--i) * calc(360deg / var(--t))))
    translateZ(calc(var(--width) * 0.09 * var(--t))) rotateX(0deg);
    transform-origin: 50% 100%;

    -webkit-clip-path: var(--clip-path);
    clip-path: var(--clip-path);
}
li:nth-of-type(even) {
    --clip-path: polygon(0% 0%, 50% 100%, 100% 0%);
}
li:nth-of-type(6n + 2) {
    background: linear-gradient(
            to right,
            hsl(343, 88%, 56%) 50%,
            hsl(343, 88%, 36%) 50%
    );
}
li:nth-of-type(6n + 3) {
    background-image: linear-gradient(
            to bottom,
            hsl(143, 70%, 18%) 0vmin,
            hsl(143, 70%, 18%) 1.8vmin,
            hsl(143, 70%, 78%) 1.8vmin,
            hsl(143, 70%, 78%) 2vmin
    );
}
li:nth-of-type(6n + 4) {
    background: repeating-linear-gradient(
            135deg,
            hsla(347, 88%, 76%, 0) 0,
            hsla(347, 88%, 76%, 0) calc(var(--unit) * 0.75),
            hsl(223, 88%, 46%) calc(var(--unit) * 0.75),
            hsl(223, 88%, 46%) calc(var(--unit) * 1.5)
    ),
    repeating-linear-gradient(
            45deg,
            hsl(347, 88%, 46%) 0,
            hsl(347, 88%, 46%) var(--unit),
            hsl(143, 38%, 36%) var(--unit),
            hsl(143, 38%, 36%) calc(var(--unit) * 1.5)
    );
    background-size: contain;
}
li:nth-of-type(6n + 5) {
    background: linear-gradient(
            to right,
            hsl(43, 88%, 36%) 50%,
            hsl(43, 88%, 56%) 50%
    );
}
li:nth-of-type(6n + 6) {
    --color: hsl(243, 8%, 86%);
    --alt: hsl(342, 88%, 46%);
    background: linear-gradient(
            to right,
            var(--color) 50%,
            hsl(243, 8%, 66%) 50%
    );
}
@supports (
  background-image:
    repeating-conic-gradient(
      at 50% 36%,
      red 30deg,
      red 45deg,
      green 45deg,
      green 60deg
    )
) {
    li:nth-of-type(6n + 6) {
        background-image: repeating-conic-gradient(
                at 50% 36%,
                var(--color) 30deg,
                var(--color) 45deg,
                var(--alt) 45deg,
                var(--alt) 60deg
        );
    }
}
ul {
    top: 8vmin;
    animation: display-case calc(var(--t) * 1000ms) infinite linear;
    animation-direction: var(--direction, normal);
    animation-delay: -10000ms;
}
.star {
    animation-duration: calc(var(--t) * 4000ms);
}
.star li {
    --clip-path: polygon(
            50% 0%,
            61% 35%,
            98% 35%,
            68% 57%,
            79% 91%,
            50% 70%,
            21% 91%,
            32% 57%,
            2% 35%,
            39% 35%
    );
    --transform: translateY(-4vmin);
    background: linear-gradient(
            to right,
            hsl(43, 88%, 36%) 50%,
            hsl(43, 88%, 56%) 50%
    );
}

@keyframes display-case {
    0% {
        transform: translate(-50%, -100%) rotateY(0deg)
        translateY(calc(var(--v, 0) * 6 * var(--unit)));
    }
    100% {
        transform: translate(-50%, -100%) rotateY(360deg)
        translateY(calc(var(--v, 0) * 6 * var(--unit)));
    }
}

@keyframes topsy-turvy {
    0% {
        transform: translate(-50%, -100%) rotateY(0deg)
        translateY(calc(var(--v, 0) * 6 * var(--unit))) rotateZ(-5deg);
    }
    50% {
        transform: translate(-50%, -100%) rotateY(180deg)
        translateY(calc(var(--v, 0) * 6 * var(--unit))) rotateZ(5deg);
    }
    100% {
        transform: translate(-50%, -100%) rotateY(360deg)
        translateY(calc(var(--v, 0) * 6 * var(--unit))) rotateZ(-5deg);
    }
}

main {
    width: 100vmin;
    height: 100vmin;
    transform-style: preserve-3d;
}

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    perspective: 120vmin;
    background: hsl(216, 80%, 12%);
    background-image: radial-gradient(
            circle at 50% 55%,
            hsl(216, 80%, 32%),
            hsl(216, 80%, 22%) 24vmin,
            hsl(216, 80%, 12%) 44vmin
    );
}
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}