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

.container {
    width: 80%;
    margin: 0 auto;
    background-color: #fff;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1, h2, h3 {
    color: #333;
}

nav ul {
    list-style-type: none;
    padding: 0;
    background-color: #007BFF;
    overflow: hidden;
}

nav ul li {
    float: left;
    display: inline;
    margin-right: 10px;
}

nav ul li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

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

form {
    margin: 20px 0;
}

form select, form input[type="submit"], form input[type="text"], form input[type="number"], form input[type="date"], form input[type="checkbox"] {
    margin-right: 10px;
    padding: 5px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

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

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

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

th {
    background-color: #f2f2f2;
}

tr:nth-child(even) {
    background-color: #f9f9f9;
}

button {
    padding: 10px 20px;
    background-color: #007BFF;
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 4px;
}

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