@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.box {
  margin-top: 40px;
  margin-left: 40px;
  height: 200px;
  width: 200px;
  background-color: tomato;
  animation: spin 2s linear infinite;
}

.anotherClass {
  color: blue;
}