body {
    background: #222;
    color: #fff;
    font-family: Arial, sans-serif;
    display: flex;
    height: 100vh;
    align-items: center;
    justify-content: center;
}

.light-container {
    text-align: center;
}

.light {
    width: 120px;
    height: 120px;
    margin: 0 auto 20px auto;
    border-radius: 50%;
    background: #444;
    box-shadow: 0 0 30px #000;
    transition: background 0.3s, box-shadow 0.3s;
}

.light.on {
    background: #ffe066;
    box-shadow: 0 0 60px 30px #ffe066, 0 0 30px #fff;
}



.light {
    width: 120px;
    height: 120px;
    margin: 0 auto 20px auto;
    border-radius: 50%;
    background: #444;
    box-shadow: 0 0 30px #000;
    transition: background 0.3s, box-shadow 0.3s;
}


.light.on.yellow {
    background: #ffe066;
    box-shadow: 0 0 60px 30px #ffe066, 0 0 30px #fff;
}


.light.on.blue {
    background: #66b3ff;
    box-shadow: 0 0 60px 30px #66b3ff, 0 0 30px #fff;
}

.light.on.green {
    background: #7cff66;
    box-shadow: 0 0 60px 30px #7cff66, 0 0 30px #fff;
}

.light.on.red {
    background: #ff6666;
    box-shadow: 0 0 60px 30px #ff6666, 0 0 30px #fff;
}


.light.on.purple {
    background: #b366ff;
    box-shadow: 0 0 60px 30px #b366ff, 0 0 30px #fff;
}



button {
    padding: 10px 30px;
    font-size: 1.1em;
    border: none;
    border-radius: 5px;
    background: #ffe066;
    color: #222;
    cursor: pointer;
    transition: background 0.2s;
}

button:hover {
    background: #ffd700;
}