body {
    font-family: Arial, sans-serif;
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    text-align: center;
}
.control {
    margin: 20px 0;
}
button {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
}
button:hover {
    background-color: #45a049;
}
#result {
    margin-top: 20px;
    font-weight: bold;
    min-height: 24px;
}
input[type="range"] {
    width: 100%;
}