html {
height: 101%;
}

body {
margin: 3em;
background-image: url(pics/bg.jpg);
background-color: #808080;
font-size: 18px;
text-align: center;
}

a {
border: 0px;
}

.in {
margin-left:auto;
margin-right:auto;
width: 800px;
height: 600px;
border: 1px black groove;
}

.nadpis {
position: relative;
top: 0px;
margin-left:auto;
margin-right:auto;
width: 600px;
height: 80px;
border: 1px black groove;
text-align: center;
}

.menu {
position: relative;
left: 0px;
top: 0px;
width: 790px;
height: 350px;
border: 1px black groove;
}

.obsah {
position: relative;
left: 0px;
width: 180px;
height: 350px;
border: 1px black groove;
}