body {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: #f0f0f0;
    margin: 50px;
    font-family: Arial, sans-serif;
}

.wheel-container {
    width: 300px;
    height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.wheel {
    width: 250px;
    height: 250px;
    background: conic-gradient(red, yellow, green);
    border-radius: 50%;
    position: relative;
    border: 5px solid #bbb;
}

.button {
    width: 80px;
    height: 80px;
    background-color: #666;
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}