body {
    font-family: Arial, sans-serif;
    background-color: #f8f9fa;
    margin: 0;
    padding: 0;
}
header {
    background-color: #343a40;
    color: #fff;
    padding: 10px 20px;
    text-align: center;
}
nav {
    margin: 20px;
    text-align: center;
}
nav a {
    margin: 0 10px;
    text-decoration: none;
    color: #007bff;
}
nav a:hover {
    text-decoration: underline;
}
table {
    width: 80%;
    margin: 20px auto;
    border-collapse: collapse;
}
table, th, td {
    border: 1px solid #ddd;
}
th, td {
    padding: 10px;
    text-align: left;
}
form {
    width: 80%;
    margin: 20px auto;
    padding: 20px;
    border: 1px solid #ddd;
    background-color: #fff;
}
form label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}
form input, form select, form textarea {
    width: 100%;
    margin-bottom: 15px;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}
button {
    background-color: #007bff;
    color: #fff;
    border: none;
    padding: 10px 15px;
    border-radius: 4px;
    cursor: pointer;
}
button:hover {
    background-color: #0056b3;
}