body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    text-align: center;
    padding: 20px;
    background-image: url('/afbeeldingen/achtergrondhardbase.jpg');
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-size: cover;
}

header {
    background-color: #333;
    padding: 10px;
    text-align: center;
    color: white;
}

nav {
    display: flex;
    justify-content: center;
    background-color: #555;
    padding: 10px;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 10px;
    margin: 0 10px;
}

#timer {
    text-align: center;
    font-size: 24px;
    margin-top: 20px;
}