.bg-bubbles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}
.bg-bubbles li {
  position: absolute;
  list-style: none;
  display: block;
   /*width: 40px;
  height: 40px;
 background-color: rgba(255, 255, 255, 0.15);*/ 
  bottom: -160px;
  -webkit-animation: square 25s infinite;
  animation: square 25s infinite;
  transition-timing-function: linear;
}
.bg-bubbles li:nth-child(1) {
  left: 10%;
}
.bg-bubbles li:nth-child(2) {
  left: 20%;

  -webkit-animation-delay: 2s;
          animation-delay: 2s;
  -webkit-animation-duration: 17s;
          animation-duration: 17s;
}
.bg-bubbles li:nth-child(3) {
  left: 25%;
  -webkit-animation-delay: 4s;
          animation-delay: 4s;
}
.bg-bubbles li:nth-child(4) {
  left: 40%;

  -webkit-animation-duration: 22s;
          animation-duration: 22s;
}
.bg-bubbles li:nth-child(5) {
  left: 70%;
}
.bg-bubbles li:nth-child(6) {
  left: 80%;

  -webkit-animation-delay: 3s;
          animation-delay: 3s;
}
.bg-bubbles li:nth-child(7) {
  left: 32%;

  -webkit-animation-delay: 7s;
          animation-delay: 7s;
}
.bg-bubbles li:nth-child(8) {
  left: 55%;

  -webkit-animation-delay: 15s;
          animation-delay: 15s;
  -webkit-animation-duration: 40s;
          animation-duration: 40s;
}
.bg-bubbles li:nth-child(9) {
  left: 25%;

  -webkit-animation-delay: 2s;
          animation-delay: 2s;
  -webkit-animation-duration: 40s;
          animation-duration: 40s;
}
.bg-bubbles li:nth-child(10) {
  left: 90%;

  -webkit-animation-delay: 11s;
          animation-delay: 11s;
}
@-webkit-keyframes square {
  0% {
    -webkit-transform: translateY(0);
            transform: translateY(0);
  }
  100% {
    -webkit-transform: translateY(-700px) rotate(600deg);
            transform: translateY(-700px) rotate(600deg);
  }
}
@keyframes square {
  0% {
    -webkit-transform: translateY(0);
            transform: translateY(0);
  }
  100% {
    -webkit-transform: translateY(-700px) rotate(600deg);
            transform: translateY(-700px) rotate(600deg);
  }
}