canvas {
    border: 1px solid black;
    width: 100%; 
    height: auto; 
    max-width: 600px; 
    max-height: 450px; 
    display: block;
    margin: 20px auto; 
}

#popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: white;
    border: 2px solid black;
    padding: 20px;
    display: none;
    text-align: center;
    z-index: 1000;
}
#popup-content {
    text-align: center;
}
#popup-button {
    margin-top: 20px;
    padding: 10px 20px;
}
body {
    position: relative;
}

#resize-alert {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    z-index: 2000;
}