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

.loading {
  margin: 4rem;
  display: flex;
  justify-content: center;
  gap: 20px;
}

span {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: violet;
  animation-duration: 1.5s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
  /* animation-fill-mode: forwards; */
}

span:nth-child(1) {
  background-color: violet;
  transform: translateX(-25px) translateY(-25px);
  animation-name: triangleRotation1;
}
span:nth-child(2) {
  background-color: slateblue;
  transform: translateX(25px) translateY(-25px);
  animation-name: triangleRotation2;
}
span:nth-child(3) {
  background-color: darkslateblue;
  transform: translateX(-55px) translateY(25px);
  animation-name: triangleRotation3;
}

@keyframes triangleRotation1 {
  33% {
    transform: translateX(65px) translateY(-25px);
  }
  66% {
    transform: translateX(25px) translateY(25px);
  }
  100% {
    transform: translateX(-25px) translateY(-25px);
  }
}
@keyframes triangleRotation2 {
  33% {
    transform: translateX(-15px) translateY(25px);
  }
  66% {
    transform: translateX(-65px) translateY(-25px);
  }
  100% {
    transform: translateX(31px) translateY(-25px);
  }
}
@keyframes triangleRotation3 {
  33% {
    transform: translateX(-105px) translateY(-25px);
  }
  66% {
    transform: translateX(-15px) translateY(-25px);
  }
  100% {
    transform: translateX(-55px) translateY(25px);
  }
}