<div class="conteiner">
  
</div>

.conteiner{
  margin: 50px auto;
  height: 75px;
            width: 75px;
            background-color: red;
        }
        .conteiner:hover{
            border-radius: 50%;
            transform: rotate(45deg);
            transition-duration: 1s;
            animation: scale 2s 1s forwards ;
        }
@keyframes scale {
  100% {
    transform: scale(2);
  }
}