<div class="loading">
  <span></span>
  <span></span>
  <span></span>
</div>

.loading {
  margin: 1rem 2rem;
  display: flex;
  justify-content: center;
  gap: 10px;
}

span {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  animation-duration: 2.5s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
  animation-fill-mode: forwards;
}

span:nth-child(1) {
  background-color: violet;
  animation-name: leftSlide;
}
span:nth-child(2) {
  background-color: rgb(235, 86, 235);
  animation-name: topSlide;
}
span:nth-child(3) {
  background-color: rgb(201, 32, 201);
  animation-name: rightSlide;
}

@keyframes leftSlide {
  20% {
    transform: translateX(-100px);
  }
  60% {
    transform: translateX(100px);
  }
  100% {
    transform: translateX(0);
  }
}
@keyframes rightSlide {
  20% {
    transform: translateX(100px);
  }
  60% {
    transform: translateX(-100px);
  }
  100% {
    transform: translateX(0);
  }
}
@keyframes topSlide {
  20% {
    transform: translateY(-25px);
  }
  60% {
    transform: translateY(25px);
  }
  100% {
    transform: translateX(0);
  }
}