body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f0f0f0;
    color: black;
}

.container {
    text-align: center;
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

#timer {
    font-size: 48px;
    margin-bottom: 20px;
}

#duration-slider {
    width: 100%;
    margin: 20px 0;
}

#slider-labels {
    margin-top: 10px;
    display: flex;
    justify-content: space-between;
}

button {
    padding: 10px 20px;
    font-size: 16px;
    margin: 5px;
    cursor: pointer;
}