body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f4f4f4;
}

.container {
    text-align: center;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    width:500px;
}
@media screen and (max-width:500px){
    .container{
        width:90%;
    }
}

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

.hidden {
    display: none;
}

canvas {
    margin-top: 20px;
    border: 1px solid #ccc;
}