.ocean {
  position:absolute;
  width: 100%;
  height: 100vh;
  background:transparent;
  top: 0;
  left: 0;
}

.bubble {
  width: 30px;
  height: 30px;
  border-radius: 100%;
  position: absolute;
  border:1px solid #ffffff;
  bottom: -30px;
  opacity: 0.7;
  animation: bubble 15s ease-in-out infinite,
    sideWays 4s ease-in-out infinite alternate;
}

@keyframes bubble {
  0% {
    transform: translateY(0%);
    opacity: 0.7;
  }
  100% {
    transform: translateY(-120vh);
  }
}

@keyframes sideWays {
  0% {
    margin-left: 0px;
  }
  100% {
    margin-left: 200px;
  }
}

.bubble--1 {
  left: 10%;
  animation-delay: 0.5s;
  animation-duration: 16s;
  opacity: 0.2;
}

.bubble--2 {
  width: 15px;
  height: 15px;
  left: 40%;
  animation-delay: 1s;
  animation-duration: 10s;
  opacity: 0.1;
}

.bubble--3 {
  width: 10px;
  height: 10px;
  left: 30%;
  animation-delay: 5s;
  animation-duration: 20s;
  opacity: 0.3;
}

.bubble--4 {
  width: 25px;
  height: 25px;
  left: 40%;
  animation-delay: 8s;
  animation-duration: 17s;
  opacity: 0.2;
}

.bubble--5 {
  width: 30px;
  height: 30px;
  left: 60%;
  animation-delay: 10s;
  animation-duration: 15s;
  opacity: 0.1;
}

.bubble--6 {
  width: 10px;
  height: 10px;
  left: 80%;
  animation-delay: 3s;
  animation-duration: 30s;
  opacity: 0.4;
}

.bubble--7 {
  width: 15px;
  height: 15px;
  left: 90%;
  animation-delay: -7s;
  animation-duration: 25s;
  opacity: 0.3;
}

.bubble--9 {
  width: 20px;
  height: 20px;
  left: 50%;
  bottom: 30px;
  animation-delay: -5s;
  animation-duration: 19s;
  opacity: 0.2;
}

.bubble--10 {
  width: 40px;
  height: 40px;
  left: 30%;
  bottom: 30px;
  animation-delay: -21s;
  animation-duration: 16s;
  opacity: 0.3;
}

.bubble--11 {
  width: 30px;
  height: 30px;
  left: 60%;
  bottom: 30px;
  animation-delay: -13.75s;
  animation-duration: 20s;
  opacity: 0.3;
}

.bubble--11 {
  width: 25px;
  height: 25px;
  left: 90%;
  bottom: 30px;
  animation-delay: -10.5s;
  animation-duration: 19s;
  opacity: 0.3;
}