.ruleta-container {
    position: relative;
    width: 100%;
    max-width: 400px;
}
canvas {
    width: 100%;
    height: auto;
    border-radius: 50%;
    border: 5px solid black;
    display: block;
}
.flecha {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 12px solid transparent;
    border-right: 12px solid transparent;
    border-top: 20px solid #fff;
    z-index: 1;
}
#ganador {
    margin-top: 20px;
    font-size: 20px;
    font-weight: bold;
    background: #52ab52;
    text-align: center;
    padding: 10px;
    border-radius: 10px;
}