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HTML

            
              <div class="fish">
  <div class="fish-body">
    <div class="eye">
      <div class="pupil"></div>
    </div>
  </div>
  <div class="fin"></div>
  <div class="fin fin-bottom"></div>
</div>

<div class="bubbles bubble-1"></div>
<div class="bubbles bubble-5"></div>
<div class="bubbles bubble-2"></div>
<div class="bubbles bubble-6"></div>
<div class="bubbles bubble-3"></div>
<div class="bubbles bubble-7"></div>
<div class="bubbles bubble-4"></div>
<div class="bubbles bubble-8"></div>
!

CSS

            
              body {
  background-color: #42a1c6;
}

/* Franklin's Container */
.fish {
  width: 150px;
  height: 100px;
  animation: swim 3s infinite; 
}

/* Franklin */
.fish-body {
  position: relative;
  margin-top: 30px;
  margin-left: 40px;
  background-color: orange;
  border-radius: 50%;
  width: 150px; 
  height: 100px;
}

.eye {
  position: absolute;
  margin-left: 100px;
  margin-top: 20px;
  z-index: 1;
  background-color: white;
  border-radius: 50%;
  width: 20px;
  height: 20px;
}

.pupil {
  position: absolute;
  z-index: 2;
  margin-left: 5px;
  margin-top: 5px;
  background-color: black;
  border-radius: 50%;
  height: 10px;
  width: 10px;
}

.fin {
  margin-top: -100px; 
  background-color: orange;
  border-radius: 50%;
  transform: rotate(40deg);
  width: 80px;
  height: 50px;
}

.fin-bottom {
  margin-top: -10px;
  transform: rotate(-40deg);
}

/* Bubbles */
.bubbles {
  position: absolute;
  bottom: 0;
  z-index: 5;
  margin-right: 50px;
  background-color: white;
  border-radius: 50%;
  opacity: .50;
  width: 40px;
  height: 40px;
  animation: up 4s infinite;
}

.bubble-2 {
  left: 350px;
  animation: up 2s infinite;
}

.bubble-3 {
  left: 750px;
  opacity: .30;
  animation: up 5s infinite;
}

.bubble-4 {
  left: 1150px;
  animation: up 6s infinite;
}

.bubble-5 {
  left: 50px;
  animation: up 5s infinite;
}

.bubble-6 {
  left: 300px;
  opacity: .30;
  animation: up 3s infinite;
}

.bubble-7 {
  left: 670px;
  animation: up 4s infinite;
}

.bubble-8 {
  left: 1050px;
  opacity: .30;
  animation: up 3s infinite;
}

/* Swim Animation */
@keyframes swim {
  0% {
    transform: translateY(-50px) translateX(0) rotate(30deg);
  }
  25% { 
    transform: translateY(50px) translateX(250px) rotate(20deg);
  }
  50% {
    transform: translateY(100px) translateX(500px);
  }
  75% {
    transform: translateY(50px) translateX(850px) rotate(-20deg);
  }
  100% {
    transform: translateY(-170px) translateX(1200px) rotate(-40deg);
  }
}

/* Bubbles Animation */
@keyframes up {
  100% {
    transform: translateY(-800px);
  }
}
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