.rainning {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 100%;
  margin: auto;
  width: 100vw;
}

.rain {
  position: absolute;
  width: 1px;
  height: 100%;
  top: 0;
  left: 50%;
  overflow: hidden;
}
.rain::after {
  content: "";
  display: block;
  position: absolute;
  height: 20vh;
  width: 100%;
  top: -50%;
  left: 0;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 0%, #ffffff 80%, #ffffff 100%);
  animation: drop 2.8s 0s infinite;
  animation-fill-mode: forwards;
  opacity: .6;
}
.rain:nth-child(1) {
  margin-left: -40%;
}
.rain:nth-child(1)::after {
  animation-delay: 1.2s;
}
.rain:nth-child(2) {
  margin-left: -30%;
}
.rain:nth-child(2)::after {
  animation-delay: 2.5s;
}
.rain:nth-child(3) {
  margin-left: -20%;
}
.rain:nth-child(3)::after {
  animation-delay: .6s;
}
.rain:nth-child(4) {
  margin-left: -10%;
}
.rain:nth-child(4)::after {
  animation-delay: 2.3s;
}
.rain:nth-child(5) {
  margin-left: 0%;
}
.rain:nth-child(5)::after {
  animation-delay: 1s;
}
.rain:nth-child(6) {
  margin-left: 10%;
}
.rain:nth-child(6)::after {
  animation-delay: .3s;
}
.rain:nth-child(7) {
  margin-left: 20%;
}
.rain:nth-child(7)::after {
  animation-delay: 2.6s;
}
.rain:nth-child(8) {
  margin-left: 30%;
}
.rain:nth-child(8)::after {
  animation-delay: 1.9s;
}
.rain:nth-child(9) {
  margin-left: 40%;
}
.rain:nth-child(9)::after {
  animation-delay: .7s;
}

@keyframes drop {
  0% {
    top: -50%;
  }
  100% {
    top: 150%;
  }
}