* {
    margin: 0;
    padding: 0;
}

body {
    text-align: center;
    padding: 100px;
    transition: background-color 0.5s ease, color 0.5s ease;
}

.light-mode {
    background-color: #ffffff;
    color: #000000;
}

.dark-mode {
    background-color: #2c2c2c;
    color: #ffffff;
}

button {
    padding: 10px;
    font-size: 24px;
    margin-top: 20px;
    cursor: pointer;
    border: none;
    border-radius: 25%;
    background-color: #007bff;
    color: white;
}