@media only screen and (min-width: 600px) {
  #email_block{
  	margin: auto;
  	width: 500px;
  }
  #contact_heading{
  	text-align: center;
  }
  .image_constraint{
  	max-width: 250px;
  }
}
@media only screen and (max-width: 600px) {
	.image_constraint{
		max-width: 300px;
	}
}