h1,h2 {
    font-family: Verdana, Tahoma, sans-serif;
    font-weight: bold;
}
p {
    font-family: Times New Roman, Times, serif;
}
a {
    color: white;
    text-decoration: none;
}
nav {
    background-color: black;
    text-align: center;
}
header {
    background-color: lightgray;
    color: black;
    text-align: center;
}
section {
    background-color: white;
    color: black;
    text-align: justify;
}
footer {
    position: fixed;
    left: 0;
    right: 0;
    width: 100%;
    background-color: black;
    color: white;
    text-align: center;
}

nav a :hover {
    color: white;
    background: red;
}

nav a:active {
    color : white;
    background : green;
    border : 5px inset 
    }
    
    
nav a vybran {
    color : white;
    background : gray;
    }
    table,th,td {
    border: 1px solid black;
    font-family: sans-serif;
    }
    
    table{
    border-collapse: collapse;
    }
    
    tr:nth-child(odd) {
    background-color: #DDDDDD;
    }
    
    td{ 
    text-align: center;
    width: 8%;
    }