body {
    font-family: Arial, sans-serif;
    background-color: lightyellow;
    margin: 30px;
}


h1 {
    text-align: center;
}


h2 {
    color: darkblue;
}


p {
    font-size: 16px;
}


.navigation {
    text-align: center;
}


.navigation img {
    border: 2px solid black;
    margin: 5px;
}


table {
    border: 2px solid black;
}


th {
    border: 1px solid black;
    padding: 10px;
    background-color: lightgray;
}


td {
    border: 1px solid black;
    padding: 10px;
}


a {
    color: darkblue;
}


a:hover {
    color: red;
}