#pdf-container {
    border: 1px solid #ccc;
    overflow: auto;
    width: 100%;
    max-height: 600px;
    background: #f9f9f9;
    padding: 10px;
    text-align: center;
}

canvas {
    display: block;
    margin: 0 auto;
    max-width: 100%;
}