#plinko-container {
    width: 800px;
    height: 600px;
    margin: 50px auto;
    background: #f0f0f0;
    border: 2px solid #333;
    position: relative;
}

#score {
    text-align: center;
    font-size: 20px;
    margin-top: 10px;
}

button#drop-ball {
    display: block;
    margin: 10px auto;
    padding: 10px 20px;
    font-size: 16px;
}
.slot-multiplier {
    position: absolute;
    bottom: 0;
    width: 8px;
    height: 50px;
    opacity: 0.5;
}

.slot-multiplier.low {
    background: blue; /* centre, x0.2 */
}

.slot-multiplier.high {
    background: red; /* bords, x1000 */
}

.slot-multiplier.mid {
    background: green; /* valeurs intermédiaires */
}