body {
    background: #0aff4f;
    color: #000;
    font-family: 'Segoe UI', sans-serif;
    text-align: center;
    margin: 0;
    padding: 0;
}
nav {
    padding: 1rem;
}
ul {
    list-style-type: none;
    padding: 0;
}
button {
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 1.2rem;
    background-color: #00bfff;
    color: #000;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}
button:hover {
    background-color: #0099cc;
}