body {
    font-family: Arial;
    text-align: center;
    background: #f2f2f2;
}
h1 {
    background: #333;
    color: white;
    padding: 20px;
}
nav {
    background: #555;
    padding: 15px;
}
nav a {
    color: white;
    margin: 15px;
    text-decoration: none;
}
form {
    background: white;
    padding: 20px;
    margin: 30px auto;
    width: 300px;
}
input {
    margin: 8px;
    padding: 8px;
}
table {
    margin: 30px auto;
    border-collapse: collapse;
    background: white;
}
th, td {
    border: 1px solid black;
    padding: 10px;
}
th {
    background: #555;
    color: white;
}