.quadrados {
    
  position: fixed;
  top: 0;
  left: 0;
  width:100%;
  height:100%;
  z-index: -100;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
  transition: all 0.4s;
   

}

.quadrados pi {
  position: absolute;
  list-style: none;
  display: block;
  background-color: #fef10094; /* rgb(74, 0, 0); */
  bottom: -300px;
  -webkit-animation: square 20s infinite;
  animation: square 20s infinite;
  transition: all 0.4s;
}

.quadrados pi:nth-child(1) {
  width: 40px;
  height: 40px;
  left: 20%;
}
.quadrados pi:nth-child(2) {
  width: 60px;
  height: 60px;
  left: 40%;
  -webkit-animation-delay: 2s;
  animation-delay: 2s;
  -webkit-animation-duration: 17s;
  animation-duration: 17s;
  transition: all 0.4s;
}

.quadrados pi:nth-child(3) {
  width: 10px;
  height: 10px;
  left: 60%;
  -webkit-animation-delay: 4s;
  animation-delay: 4s;
  -webkit-animation-duration: 13s;
  animation-duration: 13s;
  transition: all 0.4s;
}

.quadrados pi:nth-child(4) {
  width: 80px;
  height: 80px;
  left: 80%;
  -webkit-animation-delay: 1s;
  animation-delay: 1s;
  -webkit-animation-duration: 22s;
  animation-duration: 22s;
  transition: all 0.4s;
}

.quadrados pi:nth-child(5) {
  width: 50px;
  height: 50px;
  left: 50%;
  -webkit-animation-delay: 7s;
  animation-delay: 7s;
  -webkit-animation-duration: 12s;
  animation-duration: 12s;
  transition: all 0.4s;
}

@-webkit-keyframes square {
  0% {
      -webkit-transform: translateY(0);
      transform: translateY(0);
  }
  100% {
      -webkit-transform: translateY(-2080px) rotate(630deg);
      transform: translateY(-2080px) rotate(630deg);
  }
}

@keyframes square {
  0% {
      -webkit-transform: translateY(0);
      transform: translateY(0);
  }
  100% {
      -webkit-transform: translateY(-2080px) rotate(630deg);
      transform: translateY(-2080px) rotate(630deg);
  }
}