body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f4f4f4;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h2 {
    text-align: center;
    color: #333;
}

form {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 300px;
    margin: 0 auto;
}

input, select, button {
    padding: 10px;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background-color: #0056b3;
}

nav {
    margin: 20px 0;
    text-align: center;
}

nav a {
    margin: 0 10px;
    text-decoration: none;
    color: #007bff;
}

nav a:hover {
    text-decoration: underline;
}

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

th, td {
    padding: 10px;
    border: 1px solid #ccc;
    text-align: left;
}

th {
    background-color: #f8f8f8;
}

.error {
    color: red;
    text-align: center;
}

.success {
    color: green;
    text-align: center;
}