body {margin: 0; padding: 0; font-family: Helvetica, Arial, sans-serif; }

main {
	width: 100%;
	height: 100vh;
	background-image: url(bg.jpg);
	background-size: cover;
	transition: all .2s ease;
}

.button {
	width: 300px;
	height: 60px;
	margin: 0 auto;
	position: absolute;
	top: 20%;
	left: 50%;
	transform: translate(-50%, -50%);
	border-radius: 3px;
	background-color: #ff5252;
	text-align: center;
	cursor: pointer;
} 

.button span {
	line-height: 60px;
	color: #fff;
	font-weight: bold;
	font-size: 15px;
	text-transform: uppercase;
}

.overlay {
	position: absolute;
	width: 100%;
	height: 100vh;
	top: 0;
	left: 0;
	background-color: rgba(0, 0, 0, .8);
	display: none;
}

.popup {
	position: absolute;
	width: 400px;
	left: 50%;
	top: 50%;
	transform: translate(-50%, -50%);
	padding: 40px;
	box-sizing: border-box;
	background-color: white;
	color: #999A9C;
	font-size: 17px;
}

.close-popup {
	position: absolute;
	top: 15px;
	right: 15px;
	width: 23px;
	height: 23px;
	cursor: pointer;
}

.close-popup:before {
	content: '';
	background-color: #fff;
	position: absolute;
	height: 1px;
	width: 31px;
	top: 11px;
	left: -4px;
	transform: rotate(-45deg);
}

.close-popup:after {
	content: '';
	background-color: #fff;
	position: absolute;
	height: 1px;
	width: 31px;
	top: 11px;
	transform: rotate(45deg);
	left: -4px;
}

@media screen and (max-width: 768px) {

	.popup {
		
		height: 50vh;
		font-size: 15px;
	}
}

@media only screen and (max-width: 736px ) { 
		.popup {
		
		height: 60vh;
		font-size: 15px;
	}
}