body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f4f4f9;
}

header {
    text-align: center;
    margin-bottom: 20px;
}

h1 {
    font-size: 24px;
    font-weight: bold;
}

nav a {
    display: inline-block;
    margin: 5px;
    padding: 10px 20px;
    background-color: #007bff;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s;
}

nav a:hover {
    background-color: #0056b3;
}

main {
    max-width: 800px;
    margin: 0 auto;
}

.section {
    margin-bottom: 20px;
    padding: 20px;
    background-color: white;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

input[type="text"] {
    width: calc(100% - 40px);
    padding: 10px;
    margin-bottom: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
}