* {
  margin: 0;
  padding: 0;
}
body{
  font-family: "Comic Sans MS";
  color: white;
  font-weight: 300;
}

.wrapper{
  background: #FDCB34;
  background: -webkit-linear-gradient(top left, #FDCB34 0%, #53e3a6 100%);
  background: -moz-linear-gradient(top left, #FDCB34 0%, #53e3a6 100%);
  background: -o-linear-gradient(top left, #FDCB34 0%, #53e3a6 100%);
  background: linear-gradient(to bottom right, #FDCB34 0%, #FEE69F 100%);
  position: fixed;
  width: 100%;
  height:100%;
  margin: 0px;
  padding: 0px;
  overflow: auto;
}

.container{
  max-width: 600px;
  margin: 50px auto;
  height: 600px;
  text-align: center;
  position: relative;
  z-index: 1;
}
  h1{
    font-size: 40px;
    transition-duration: 1s;
    transition-timing-function: ease-in-put;
    font-weight: 200;
  }
.animation-area {
  width: 100%;
}
.box-area {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}
.box-area li {
  position: absolute;
  display: block;
  list-style: none;
  width: 25px;
  height: 25px;
  background: rgba(255, 255, 255, 0.5);
  animation: animate 20s linear infinite;
  bottom: -150px;
}
.box-area li:nth-child(1) {
  left: 86%;
  width: 80px;
  height: 80px;
  animation-delay: 0s;
}
.box-area li:nth-child(2) {
  left: 12%;
  width: 30px;
  height: 30px;
  animation-delay: 1.5s;
  animation-duration: 10s;
}
.box-area li:nth-child(3) {
  left: 70%;
  width: 100px;
  height: 100px;
  animation-delay: 5.5s;
}
.box-area li:nth-child(4) {
  left: 42%;
  width: 150px;
  height: 150px;
  animation-delay: 0s;
  animation-duration: 15s;
}
.box-area li:nth-child(5) {
  left: 65%;
  width: 40px;
  height: 40px;
  animation-delay: 0s;
}
.box-area li:nth-child(6) {
  left: 15%;
  width: 110px;
  height: 110px;
  animation-delay: 3.5s;
}
@keyframes animate {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
    z-index: 0 !important;
  }
  100% {
    transform: translateY(-800px) rotate(360deg);
    opacity: 0;
    z-index: 0 !important;
  }
}