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

header {
    background: #2c3e50;
    color: white;
    padding: 15px;
}

header h1 {
    margin: 0;
}

nav a {
    color: white;
    margin-right: 15px;
    text-decoration: none;
    font-weight: bold;
}

main {
    padding: 20px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

table th, table td {
    padding: 10px;
    border: 1px solid #ddd;
}

button, input[type="submit"] {
    background: #3498db;
    color: white;
    padding: 10px 15px;
    border: none;
    cursor: pointer;
}

button:hover, input[type="submit"]:hover {
    background: #2980b9;
}

form {
    background: white;
    padding: 20px;
    border-radius: 5px;
}