body {
	margin: 0;
	padding: 0;
}

.responsive {
	width: 100%;
	height: auto;
	max-width: 600px;
}

.envelope img {
	width: 55px;
    float: right;
	padding: 40px;
	transition: 0.5s ease;
	
}

.envelope img:hover {
	opacity: 0.5;
	transform: scale(0.9);
}

#wrap {
	height: 100vh;	
	background-image: url("img/site-back.jpg");
	background-size: cover;
	background-repeat: no-repeat;
}

#center	 {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
     
}