Seasonals/seasonals/autumn.css

.autumn-container {
  display: block;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.leaf {
  position: fixed;
  top: -10%;
  font-size: 1em;
  color: #fff;
  font-family: Arial, sans-serif;
  text-shadow: 0 0 5px #000;
  user-select: none;
  -webkit-user-select: none;
  cursor: default;
  -webkit-animation-name: leaf-fall, leaf-shake;
  -webkit-animation-duration: 7s, 4s;
  -webkit-animation-timing-function: linear, ease-in-out;
  -webkit-animation-iteration-count: infinite, infinite;
  -webkit-user-select: none;
  animation-name: leaf-fall, leaf-shake;
  animation-duration: 7s, 4s;
  animation-timing-function: linear, ease-in-out;
  animation-iteration-count: infinite, infinite;
}

/* Class to disable rotation */
.no-rotation {
  --rotate-start: 0deg !important;
  --rotate-end: 0deg !important;
}

@-webkit-keyframes leaf-fall {
  0% {
    top: -10%;
  }

  100% {
    top: 100%;
  }
}

@keyframes leaf-fall {
  0% {
    top: -10%;
  }

  100% {
    top: 100%;
  }
}

@-webkit-keyframes leaf-shake {
  0%, 100% {
    -webkit-transform: translateX(0) rotate(var(--rotate-start, -20deg));
  }
  50% {
    -webkit-transform: translateX(80px) rotate(var(--rotate-end, 20deg));
  }
}

@keyframes leaf-shake {
  0%, 100% {
    transform: translateX(0) rotate(var(--rotate-start, -20deg));
  }
  50% {
    transform: translateX(80px) rotate(var(--rotate-end, 20deg));
  }
}

.leaf:nth-of-type(0) {
  left: 0%;
  animation-delay: 0s, 0s;
  --rotate-start: -25deg;
  --rotate-end: 22deg;
}

.leaf:nth-of-type(1) {
  left: 10%;
  animation-delay: 1s, 0.5s;
  --rotate-start: -32deg;
  --rotate-end: 35deg;
}

.leaf:nth-of-type(2) {
  left: 20%;
  animation-delay: 6s, 1s;
  --rotate-start: -28deg;
  --rotate-end: 28deg;
}

.leaf:nth-of-type(3) {
  left: 30%;
  animation-delay: 4s, 1.5s;
  --rotate-start: -38deg;
  --rotate-end: 32deg;
}

.leaf:nth-of-type(4) {
  left: 40%;
  animation-delay: 2s, 0.8s;
  --rotate-start: -22deg;
  --rotate-end: 38deg;
}

.leaf:nth-of-type(5) {
  left: 50%;
  animation-delay: 8s, 2s;
  --rotate-start: -35deg;
  --rotate-end: 25deg;
}

.leaf:nth-of-type(6) {
  left: 60%;
  animation-delay: 6s, 1.2s;
  --rotate-start: -40deg;
  --rotate-end: 40deg;
}

.leaf:nth-of-type(7) {
  left: 70%;
  animation-delay: 2.5s, 0.3s;
  --rotate-start: -30deg;
  --rotate-end: 30deg;
}

.leaf:nth-of-type(8) {
  left: 80%;
  animation-delay: 1s, 1.8s;
  --rotate-start: -26deg;
  --rotate-end: 36deg;
}

.leaf:nth-of-type(9) {
  left: 90%;
  animation-delay: 3s, 0.7s;
  --rotate-start: -34deg;
  --rotate-end: 24deg;
}

.leaf:nth-of-type(10) {
  left: 25%;
  animation-delay: 2s, 2.3s;
  --rotate-start: -29deg;
  --rotate-end: 33deg;
}

.leaf:nth-of-type(11) {
  left: 65%;
  animation-delay: 4s, 1.4s;
  --rotate-start: -37deg;
  --rotate-end: 27deg;
}