/* Circles container */
.circles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

/* Common styles for circles */
.circle {
  position: absolute;
  display: block;
  list-style: none;
  background: rgba(255, 255, 255, 0.2);
  bottom: -150px;
  animation: animate 25s linear infinite;
  border-radius: 50%;
}

/* Circle sizes and positions */
.circle1 {
  width: 80px;
  height: 80px;
  left: 25%;
  animation-delay: 0s;
}

.circle2 {
  width: 20px;
  height: 20px;
  left: 10%;
  animation-delay: 2s;
  animation-duration: 12s;
}

.circle3 {
  width: 20px;
  height: 20px;
  left: 70%;
  animation-delay: 4s;
}

.circle4 {
  width: 60px;
  height: 60px;
  left: 40%;
  animation-delay: 0s;
  animation-duration: 18s;
}

.circle5 {
  width: 20px;
  height: 20px;
  left: 65%;
  animation-delay: 0s;
}

.circle6 {
  width: 110px;
  height: 110px;
  left: 75%;
  animation-delay: 3s;
}

.circle7 {
  width: 150px;
  height: 150px;
  left: 35%;
  animation-delay: 7s;
}

.circle8 {
  width: 25px;
  height: 25px;
  left: 50%;
  animation-delay: 15s;
  animation-duration: 45s;
}

.circle9 {
  width: 15px;
  height: 15px;
  left: 20%;
  animation-delay: 2s;
  animation-duration: 35s;
}

.circle10 {
  width: 150px;
  height: 150px;
  left: 85%;
  animation-delay: 0s;
  animation-duration: 11s;
}

/* Animation */
@keyframes animate {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(-1000px) rotate(720deg);
    opacity: 0;
  }
}