body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f9f9f9;
}
header {
    background: #333;
    color: #fff;
    padding: 10px 20px;
}
header nav a {
    color: #fff;
    margin-right: 10px;
    text-decoration: none;
}
main {
    padding: 20px;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}
table, th, td {
    border: 1px solid #ccc;
}
th, td {
    padding: 10px;
    text-align: left;
}
button, input[type="submit"] {
    padding: 5px 10px;
}
form input, form textarea {
    display: block;
    margin-bottom: 10px;
    padding: 5px;
    width: 100%;
    max-width: 400px;
}

select {
    height: 32px;
}