body {
    background-color: #eee;
}

header {
	background-color: #ddd;
	text-align: left;
	padding: 5px 15px;
	color: #fff;
}

#demo-text {
    font-size: 50px;
    padding: 50px 0 80px;
    border: 2px solid #333;
    margin: 20px 0;
    background-color: #fff;
    overflow: hidden;
	text-align: center;
	width: 100%;
	height: 100%;
	display: block;
}

#your-code {
    width: 100%;
    display: block;
    padding: 10px;
}