body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    background-color: #f4f4f4;
}

header {
    background-color: #4CAF50;
    color: white;
    text-align: center;
    padding: 1rem;
    margin-bottom: 20px;
}

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

form {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

input, button {
    padding: 10px;
    font-size: 16px;
}

button {
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background-color: #45a049;
}

ul {
    list-style-type: none;
    padding: 0;
}

li {
    background-color: white;
    margin-bottom: 10px;
    padding: 10px;
    border-radius: 5px;
}