* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}


header {
    background-color: grey; 
    color: white;
    text-align: center;
    padding: 20px 0;
}

header h1 {
    margin: 0;
    font-size: 28px;
}



body {
    background-color: white;
}

table {
    width: 50%;
    margin:20px;
    font-family: Arial, sans-serif;
}

th,td {
    border: 1px solid black; 
    padding: 8px;
    text-align: center;
}


nav {
    background-color: #333;
    text-align: center;
    padding: 10px 0;
}

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

nav a:hover {
    color: rgb(38, 99, 111); 
}

main {
    background-color: #fff;
    padding: 20px;
    min-height: 300px;
}

main h2 {
    margin-bottom: 10px;
    font-size: 22px;
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 15px 0;
    margin-top: 20px;
}