.post_button2{
  animation: dokidoki 0.8s ease-out -2s infinite alternate;
}

@media screen and (min-width: 481px) {
	@keyframes dokidoki{
		0%{width:500px; height:auto;}
		100%{width:511px; height:auto;}
	}
}
@media screen and (max-width: 480px) {
	@keyframes dokidoki{
		0%{width:75%; height:auto;}
		100%{width:80%; height:auto;}
	}
}