body {
font-family: Arial, sans-serif;
font-size: 20px;
margin: 0;
background-color: #f4f4f4;
color: #333;
}

header {
background: #4c82af;
color: white;
padding: 20px;
text-align: center;
}

nav {
background: black;
padding: 10px;
text-align: center;
}

nav a {
color: white;
margin: 0 15px;
text-decoration: none;
font-weight: bold;
cursor: pointer;
transition: 0.3s;
}

nav a:hover {
color: #3e5bc6;
}

section {
display: none;
padding: 40px;
max-width: 900px;
margin: 20px auto;
background: white;
border-radius: 10px;
box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

section.active {
display: block;
}

h2 {
color: #4c82af;
}



.obrvlavo{float:left;}
.obrvpravo{float:right}


footer {
text-align: center;
padding: 20px;
background: black;
color: white;
margin-top: 20px;
}
/*nastavenie pre mobil*/
@media(min-width:481px){
nav{
    box-sizing: border-box;
}
    
main{
    overflow: auto;
    box-sizing: border-box; 
    }   
}