body {
  background: url("../images/ocean.jpg") no-repeat center center fixed;
  background-size: cover;
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.fishes {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-auto-rows: auto;
  gap: 60px 20px;
  justify-items: center;
  align-items: center;
  max-width: 1200px;
  width: 90%;
  padding: 40px 0;
}

.fishes img {
  max-height: 140px;
  width: auto;
  object-fit: contain;
}

/* animation to make all fishes swim from side to side, and up and down */
@keyframes fish-swim {
  0% {
    transform: translateX(0px);
  }
  25% {
    transform: translateY(10px);
  }
  50% {
    transform: translateX(30px);
  }
  75% {
    transform: translateY(-10px);
  }
  100% {
    transform: translateX(-30px);
  }
}

.swim {
  animation-name: fish-swim;
  animation-duration: 5s;
  animation-iteration-count: infinite;
  animation-timing-function: ease-in-out;
  animation-direction: alternate;
}