.circles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: -1;
}

.circles li {
  position: absolute;
  display: block;
  list-style: none;
  width: 20px;
  height: 20px;
  background: rgba(152, 152, 152, 0.2);
  animation: animate 15s linear infinite;
  bottom: -150px;
}

.circles li:nth-child(1) {
  left: 25%;
  width: 80px;
  height: 80px;
  background: url("../images/logo/plane.png") center no-repeat;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  filter: opacity(0.1);
  animation-delay: 0s;
}

.circles li:nth-child(2) {
  left: 10%;
  width: 50px;
  height: 50px;
    background: url("../images/logo/market.png") center no-repeat;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  filter: opacity(0.1);
  animation-delay: 2s;
  animation-duration: 12s;
}

.circles li:nth-child(3) {
  left: 70%;
  width: 20px;
  height: 20px;
  animation-delay: 4s;
}

.circles li:nth-child(4) {
  left: 20%;
  width: 60px;
  height: 60px;
   background: url("../images/logo/coffee.png") center no-repeat;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  filter: opacity(0.1);
  animation-delay: 0s;
  animation-duration: 23s;
}

.circles li:nth-child(5) {
  left: 65%;
  width: 20px;
  height: 20px;
  animation-delay: 0s;
}

.circles li:nth-child(6) {
  left: 75%;
  width: 95px;
  height: 95px;
  background: url("../images/logo/cog.png") center no-repeat;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  animation-delay: 3s;
  filter: opacity(0.1);
}

.circles li:nth-child(7) {
  left: 35%;
  width: 120px;
  height: 120px;
  background: url("../images/logo/pouyanotext.png") center no-repeat;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  filter: opacity(0.1);
  animation-delay: 7s;
}

.circles li:nth-child(8) {
  left: 50%;
  width: 25px;
  height: 25px;
  animation-delay: 15s;
  animation-duration: 45s;
}

.circles li:nth-child(9) {
  left: 20%;
  width: 15px;
  height: 15px;
  animation-delay: 2s;
  animation-duration: 35s;
}

.circles li:nth-child(10) {
  left: 85%;
  width: 150px;
  height: 150px;
     background: url("../images/logo/food.png") center no-repeat;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  filter: opacity(0.1);
  animation-delay: 0s;
  animation-duration: 11s;
}

@keyframes animate {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
    border-radius: 0;
  }

  100% {
    transform: translateY(-1000px) rotate(720deg);
    opacity: 0;
    border-radius: 50%;
  }
}

.fade-in {
  opacity: 0;
  transition: opacity 1s ease-in-out;
}

.fade-in.show {
  opacity: 1;
}