body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

header {
    background: #333;
    color: #fff;
    padding: 10px 20px;
    text-align: center;
}

nav a {
    color: #fff;
    margin: 0 10px;
    text-decoration: none;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

table, th, td {
    border: 1px solid #ddd;
}

th, td {
    padding: 10px;
    text-align: left;
}

form {
    margin: 20px 0;
}

input, textarea, select {
    display: block;
    margin: 10px 0;
    padding: 10px;
    width: 100%;
    max-width: 300px;
}

button {
    padding: 10