codepens/flipboxes/dist/style.css

@import url("https://fonts.googleapis.com/css2?family=Ubuntu:wght@400;700&display=swap");
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: "Ubuntu", sans-serif;
  background-color: #ddd;
  color: #000;
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  perspective: 750px;
}

*:not(:empty) {
  transform-style: preserve-3d;
}

.checkboxes {
  width: 100%;
  max-width: 420px;
}

.flipBox {
  position: relative;
  display: block;
  text-align: left;
  margin: 1em auto;
  cursor: pointer;
}
.flipBox:active > .flipBox_boxOuter {
  height: 25%;
}
.flipBox span {
  padding-left: 1.25em;
}
.flipBox > input {
  -webkit-appearance: none;
     -moz-appearance: none;
          appearance: none;
  position: fixed;
  left: -100vmax;
  top: -100vmax;
}
.flipBox > input:checked ~ .flipBox_boxOuter {
  -webkit-animation: flipBox1 1s forwards linear;
          animation: flipBox1 1s forwards linear;
}
.flipBox > input:checked ~ .flipBox_boxOuter .flipBox_box {
  -webkit-animation: flipBox2 1s forwards ease-in-out;
          animation: flipBox2 1s forwards ease-in-out;
}
.flipBox > input:checked ~ .flipBox_shadow {
  -webkit-animation: flipBox3 1s forwards ease-in-out;
          animation: flipBox3 1s forwards ease-in-out;
}
.flipBox > input:not(:checked) ~ .flipBox_boxOuter {
  -webkit-animation: flipBox4 1s forwards linear;
          animation: flipBox4 1s forwards linear;
}
.flipBox > input:not(:checked) ~ .flipBox_boxOuter .flipBox_box {
  -webkit-animation: flipBox5 1s forwards ease-in-out;
          animation: flipBox5 1s forwards ease-in-out;
}
.flipBox > input:not(:checked) ~ .flipBox_shadow {
  -webkit-animation: flipBox6 1s forwards ease-in-out;
          animation: flipBox6 1s forwards ease-in-out;
}
.flipBox > input:disabled ~ * {
  cursor: not-allowed;
}
.flipBox > input:disabled ~ .flipBox_boxOuter {
  height: 0%;
}
.flipBox > input:disabled ~ .flipBox_boxOuter .flipBox_box > div:nth-child(6) {
  background-color: #ccc;
}
.flipBox > input:disabled ~ .flipBox_boxOuter .flipBox_box > div:nth-child(-n+5), .flipBox > input:disabled ~ .flipBox_boxOuter ~ .flipBox_shadow {
  display: none;
}
.flipBox > input:focus-visible ~ span {
  outline: 1px #000 solid;
  outline-offset: 0.25em;
}
.flipBox_boxOuter {
  position: absolute;
  left: 0;
  top: 50%;
  width: 1em;
  height: 1em;
  transform-origin: top;
  transition: height 0.25s;
}
.flipBox_box {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 1em;
  height: 100%;
  transform: translate(-50%, -50%);
}
.flipBox_box > div {
  position: absolute;
  width: 1em;
  box-shadow: 0 0 0.25em #0007 inset;
}
.flipBox_box > div:nth-child(1) {
  background-image: linear-gradient(green, white);
  transform: rotateY(0deg) translateX(50%) rotateY(90deg);
  height: 100%;
}
.flipBox_box > div:nth-child(2) {
  background-image: linear-gradient(green, white);
  transform: rotateY(90deg) translateX(50%) rotateY(90deg);
  height: 100%;
}
.flipBox_box > div:nth-child(3) {
  background-image: linear-gradient(green, white);
  transform: rotateY(180deg) translateX(50%) rotateY(90deg);
  height: 100%;
}
.flipBox_box > div:nth-child(4) {
  background-image: linear-gradient(green, white);
  transform: rotateY(270deg) translateX(50%) rotateY(90deg);
  height: 100%;
}
.flipBox_box > div:nth-child(5) {
  background-color: green;
  transform: rotateX(90deg) translateY(-0.5em);
  transform-origin: top;
  height: 1em;
}
.flipBox_box > div:nth-child(5)::after {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: white;
  -webkit-clip-path: polygon(12.5% 56.25%, 25% 43.75%, 37.5% 56.25%, 75% 18.75%, 87.5% 31.25%, 37.5% 81.25%, 12.5% 56.25%);
          clip-path: polygon(12.5% 56.25%, 25% 43.75%, 37.5% 56.25%, 75% 18.75%, 87.5% 31.25%, 37.5% 81.25%, 12.5% 56.25%);
}
.flipBox_box > div:nth-child(6) {
  bottom: 0;
  background-color: white;
  transform: rotateX(90deg) translateY(0.5em);
  transform-origin: bottom;
  height: 1em;
}
.flipBox_shadow {
  position: absolute;
  left: 0;
  top: 50%;
  width: 1em;
  height: 1em;
  transform: translateY(-50%) translateZ(-1px);
  background-color: #0007;
  filter: blur(0.2em);
}
@-webkit-keyframes flipBox1 {
  0%, 100% {
    transform: rotateX(90deg);
    -webkit-animation-timing-function: ease-out;
            animation-timing-function: ease-out;
  }
  50% {
    transform: rotateX(90deg) translateY(2em);
    -webkit-animation-timing-function: ease-in;
            animation-timing-function: ease-in;
  }
}
@keyframes flipBox1 {
  0%, 100% {
    transform: rotateX(90deg);
    -webkit-animation-timing-function: ease-out;
            animation-timing-function: ease-out;
  }
  50% {
    transform: rotateX(90deg) translateY(2em);
    -webkit-animation-timing-function: ease-in;
            animation-timing-function: ease-in;
  }
}
@-webkit-keyframes flipBox2 {
  from {
    transform: translate(-50%, -50%) rotateX(0deg) rotateY(180deg);
  }
  to {
    transform: translate(-50%, -50%) rotateX(-180deg) rotateY(0deg);
  }
}
@keyframes flipBox2 {
  from {
    transform: translate(-50%, -50%) rotateX(0deg) rotateY(180deg);
  }
  to {
    transform: translate(-50%, -50%) rotateX(-180deg) rotateY(0deg);
  }
}
@-webkit-keyframes flipBox3 {
  0%, 100% {
    transform: translateY(-50%) translateZ(-1px) scale(1);
    -webkit-animation-timing-function: ease-out;
            animation-timing-function: ease-out;
  }
  50% {
    transform: translateY(-50%) translateZ(-1px) scale(1.5);
    -webkit-animation-timing-function: ease-in;
            animation-timing-function: ease-in;
  }
}
@keyframes flipBox3 {
  0%, 100% {
    transform: translateY(-50%) translateZ(-1px) scale(1);
    -webkit-animation-timing-function: ease-out;
            animation-timing-function: ease-out;
  }
  50% {
    transform: translateY(-50%) translateZ(-1px) scale(1.5);
    -webkit-animation-timing-function: ease-in;
            animation-timing-function: ease-in;
  }
}
@-webkit-keyframes flipBox4 {
  0%, 100% {
    transform: rotateX(90deg);
    -webkit-animation-timing-function: ease-out;
            animation-timing-function: ease-out;
  }
  50% {
    transform: rotateX(90deg) translateY(2em);
    -webkit-animation-timing-function: ease-in;
            animation-timing-function: ease-in;
  }
}
@keyframes flipBox4 {
  0%, 100% {
    transform: rotateX(90deg);
    -webkit-animation-timing-function: ease-out;
            animation-timing-function: ease-out;
  }
  50% {
    transform: rotateX(90deg) translateY(2em);
    -webkit-animation-timing-function: ease-in;
            animation-timing-function: ease-in;
  }
}
@-webkit-keyframes flipBox5 {
  from {
    transform: translate(-50%, -50%) rotateX(-180deg) rotateY(0deg);
  }
  to {
    transform: translate(-50%, -50%) rotateX(-360deg) rotateY(180deg);
  }
}
@keyframes flipBox5 {
  from {
    transform: translate(-50%, -50%) rotateX(-180deg) rotateY(0deg);
  }
  to {
    transform: translate(-50%, -50%) rotateX(-360deg) rotateY(180deg);
  }
}
@-webkit-keyframes flipBox6 {
  0%, 100% {
    transform: translateY(-50%) translateZ(-1px) scale(1);
    -webkit-animation-timing-function: ease-out;
            animation-timing-function: ease-out;
  }
  50% {
    transform: translateY(-50%) translateZ(-1px) scale(1.5);
    -webkit-animation-timing-function: ease-in;
            animation-timing-function: ease-in;
  }
}
@keyframes flipBox6 {
  0%, 100% {
    transform: translateY(-50%) translateZ(-1px) scale(1);
    -webkit-animation-timing-function: ease-out;
            animation-timing-function: ease-out;
  }
  50% {
    transform: translateY(-50%) translateZ(-1px) scale(1.5);
    -webkit-animation-timing-function: ease-in;
            animation-timing-function: ease-in;
  }
}

@media (prefers-reduced-motion) {
  .flipBox_boxOuter,
.flipBox_box,
.flipBox_shadow {
    -webkit-animation-play-state: paused !important;
            animation-play-state: paused !important;
  }

  .flipBox_boxOuter {
    transition: none;
  }
}