<div class="box"/>

.box {
  width: 50px;
  height: 50px;
  margin: 0 auto;  
  background: #007EA7;
  border-radius: 10px;
  animation: loading .8s ease-in-out alternate infinite;
}

@keyframes loading {
  50% {    
    background: #003459;
    border-radius: 25px;
    box-shadow: 0 0 1px 3px rgba(148, 187, 233, 0.7);
  }
  100% {
    transform: rotate(1turn) scale(0.7);   
  }
}