Bouncing off the walls...

bouncing-off-the-walls.markdown

Bouncing off the walls...

A Pen by Ela on CodePen.

License.

index.html

<div class="fall">

  <div class="walls">
    <div class="wall"><div class="top"></div><div class="bottom"></div><div class="left"></div><div class="right"></div><div class="ceil"></div></div>
    <div class="wall"><div class="top"></div><div class="bottom"></div><div class="left"></div><div class="right"></div><div class="ceil"></div></div>
    <div class="wall"><div class="top"></div><div class="bottom"></div><div class="left"></div><div class="right"></div><div class="ceil"></div></div>
    <div class="wall"><div class="top"></div><div class="bottom"></div><div class="left"></div><div class="right"></div><div class="ceil"></div></div>
    <div class="wall"><div class="top"></div><div class="bottom"></div><div class="left"></div><div class="right"></div><div class="ceil"></div></div>
    <div class="wall"><div class="top"></div><div class="bottom"></div><div class="left"></div><div class="right"></div><div class="ceil"></div></div>
    <div class="wall"><div class="top"></div><div class="bottom"></div><div class="left"></div><div class="right"></div><div class="ceil"></div></div>
    <div class="wall"><div class="top"></div><div class="bottom"></div><div class="left"></div><div class="right"></div><div class="ceil"></div></div>
    <div class="wall"><div class="top"></div><div class="bottom"></div><div class="left"></div><div class="right"></div><div class="ceil"></div></div>
    <div class="wall"><div class="top"></div><div class="bottom"></div><div class="left"></div><div class="right"></div><div class="ceil"></div></div>
  </div>

  <div class="ballArm">
    <div class="ball"></div>
  </div>
</div>

scripts

<script src="https://assets.codepen.io/1948355/twitterButton-2.1.0.js"></script>

style.scss

*, *::before, *::after {
  padding: 0;
  margin: 0 auto;
  box-sizing: border-box;
}

$size: 20px;
$speed: 15s;

body {
  background-color: #111;
  color: #fff;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  perspective: 800px;
  overflow: hidden;
}

.fall {
  position: relative;
  transform-style: preserve-3d;
  animation: fallRotate $speed*2.8 infinite linear;

  @keyframes fallRotate {
    to { transform: rotateY(360deg); }
  }
}

.walls {
    transform-style: preserve-3d;
}

.wall {
  position: absolute;
  width: $size * 4;
  height: $size * 4;
  transform-style: preserve-3d;
  background-image: linear-gradient(#0007, #000c);
  animation: move $speed infinite linear;

  &:nth-child(odd) {
    left: $size * -0.5;
    transform: translate(-50%, 50%) rotateY(90deg) rotateX(45deg) translatez($size * -1) translateY($size * -11);
  }
  &:nth-child(even) {
    left: $size * 0.5;
    transform: translate(-50%, 50%) rotateY(-90deg) rotateX(45deg) translatez($size * -1) translateY($size * -11);
  }

  @for $i from 0 to 10 {
    &:nth-child(#{$i + 1}) {
      animation-delay: $speed / -10 * ($i + 1);
      background-color: hsla($i * 36, 75%, 75%, 1);
    }
  }
  bottom: $size * -10.5;
  @keyframes move {
    from { bottom: $size * -60.5; }
    to { bottom: $size * 40.5; }
  }

  & > div {
    position: absolute;
    background-color: inherit;
  }

  .ceil {
    width: $size * 4;
    height: $size * 4;
    background-image: linear-gradient(#fff7, #fff0);
    animation: wallCeil $speed infinite linear;
    animation-delay: inherit;
    overflow: hidden;

    &::after {
      content: '';
      position: absolute;
      width: 100%; height: 100%;
      background-image: radial-gradient(#000, #0000 50%);
      animation: shadow $speed infinite linear;
      animation-delay: inherit;

      @keyframes shadow {
        0%, 48%, 53%, 100% {
          opacity: 0;
          transform: translateY($size * 4) scale(2);
        }
        50% {                    
          opacity: 0.25;
          transform: translateY($size * 0.2) scale(0.5);
        }
      }
    }
  }

  .top {
    width: $size * 4;
    transform: rotateX(90deg);
    transform-origin: top;
    background-image: linear-gradient(#0007, #fff7);
    animation: wallHeight $speed infinite linear;
    animation-delay: inherit;
  }

  .bottom {
    bottom: 0;
    width: $size * 4;
    transform: rotateX(-90deg);
    transform-origin: bottom;
    background-image: linear-gradient(#fff0, #000c);
    animation: wallHeight $speed infinite linear;
    animation-delay: inherit;
  }

  .left {
    bottom: 0;
    height: $size * 4;
    transform: rotateY(-90deg);
    transform-origin: left;
    background-image: linear-gradient(to bottom left, #fff3, #000c);
    animation: wallWidth $speed infinite linear;
    animation-delay: inherit;
  }

  .right {
    bottom: 0; right: 0;
    height: $size * 4;
    transform: rotateY(90deg);
    transform-origin: right;
    background-image: linear-gradient(to bottom right, #fff3, #000c);
    animation: wallWidth $speed infinite linear;
    animation-delay: inherit;
  }

  @keyframes wallCeil {
    0%, 49.75%, 55%, 100% { transform: translateZ($size * 1); }
    50% { transform: translateZ($size * 0.5); }
  }

  @keyframes wallHeight {
    0%, 49.75%, 55%, 100% { height: $size * 1; }
    50% { height: $size * 0.5; }
  }

  @keyframes wallWidth {
    0%, 49.75%, 55%, 100% { width: $size * 1; }
    50% { width: $size * 0.5; }
  }

}

.ballArm {
  position: absolute;
  bottom: $size * -10.5;
  width: $size;
  height: $size * 12;
  transform-origin: bottom;
  transform-style: preserve-3d;
  animation: armRotate $speed/10 infinite linear alternate;

  @keyframes armRotate {
    from { transform: translateX(-50%) rotate(-45deg); }
    to { transform: translateX(-50%) rotate(45deg); }
  }
}

.ball {
  position: absolute;
  width: $size;
  height: $size;
  border-radius: 10%;
  transform-style: preserve-3d;
  animation: ballRotateZ $speed/10 infinite linear alternate;

  @keyframes ballRotateZ {
    from { transform: rotate(45deg); }
    to { transform: rotate(-45deg); }
  }

  &::after {
    content: '';
    position: absolute;
    width: $size;
    height: $size;
    background-image: radial-gradient(circle at top, #fff, #222);
    border-radius: 50%;
    animation: ballRotateY $speed*2.8 infinite linear;

    @keyframes ballRotateY {
      from { transform: rotateY(0deg); }
      to { transform: rotateY(-360deg); }
    }
  }
}