body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}
header {
    background-color: #4CAF50;
    color: white;
    padding: 10px 0;
    text-align: center;
}
nav {
    margin: 0;
    padding: 10px;
    background-color: #333;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}
th, td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: left;
}
th {
    background-color: #f2f2f2;
}
tr:nth-child(even) {
    background-color: #f9f9f9;
}
tr:hover {
    background-color: #ddd;
}
button {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 10px 15px;
    cursor: pointer;
}
button:hover {
    background-color: #45a049;
}