@keyframes logo_ani {
		30% {opacity: 0.5; transform: scale(1.0);}			
		100% {opacity: 1; transform: scale(1.25);}				
}	

.feedback {
  display: inline-block;
  width: 64px;
  height: 64px;
  background-size: cover;
  cursor: pointer;
}
/* feedback_0*/
	.feedback_0 {
	  background-image: url(feedback_0.png);
	}
	.feedback_0:hover,
	.feedback_0:focus {
	  background-image: url(feedback_0.png);
	  animation: logo_ani 1s  ease-in-out infinite alternate;
	}
	
/* feedback_1*/
	.feedback_1 {
	  background-image: url(feedback_1.png);
	}
	.feedback_1:hover,
	.feedback_1:focus {
	  background-image: url(feedback_1.png);
	  animation: logo_ani 1s  ease-in-out infinite alternate;
	}	
	
/* feedback_2*/
	.feedback_2 {
	  background-image: url(feedback_2.png);
	}
	.feedback_2:hover,
	.feedback_2:focus {
	  background-image: url(feedback_2.png);
	  animation: logo_ani 1s  ease-in-out infinite alternate;
	}	

/* feedback_3*/
	.feedback_3 {
	  background-image: url(feedback_3.png);
	}
	.feedback_3:hover,
	.feedback_3:focus {
	  background-image: url(feedback_3.png);
	  animation: logo_ani 1s  ease-in-out infinite alternate;
	}	
	
/* feedback_4*/
	.feedback_4 {
	  background-image: url(feedback_4.png);
	}
	.feedback_4:hover,
	.feedback_4:focus {
	  background-image: url(feedback_4.png);
	  animation: logo_ani 1s  ease-in-out infinite alternate;
	}