body { 
	margin: 0px; 
	padding: 0px; 
	background-color: #ffffff;
	height: 100%;
	color: black;
	text-align: center; 
	font-family: Quicksand, Helvetica, Arial, sans-serif;
	font-size: 23px;	
}

        html, body {
            height: 100%;
            margin: 0;
            padding: 0;
            width: 100%;
        }

        body {
            display: table;
        }

        .my-block {
            text-align: center;
            display: table-cell;
            vertical-align: middle;
        }
#obrazek {
	width: 540px;
	height: 565px;

}