*{
	margin:0; 
	padding:0;
}

html {
	width:100%;
	height:100%;
}

body {
	font-family:Tahoma, Helvetica, sans-serif;
}

section{
	width:100%; 
	height:1000px; 
	float:left;
}



nav{
	width:100%; 
	position:fixed; 
	z-index:1; 
	top:70px;
    font-size:14pt;
    font-weight: bold;
}


ul{width:40%; margin:0 auto; list-style:none;}

ul li{float:left; margin-right:30px;}

ul li a{color:#ccc; text-decoration:none;}

ul li a:hover{text-decoration:underline;}

h1{color:#ccc; text-align:center; margin-top:150px; font-size: 25pt;}

.opis {
    height:50px;
    width:500px;
    background-color:rgba(255,255,255,0.7);
    padding: 20px;
    margin: 50px;
}

.opis:hover {
    background-color:rgba(255,255,255,1);
    color:#0450bb;
}