.ptc-wrap {
    max-width: 700px;
    margin: auto;
    text-align: center;
}

#ptc-canvas {
    max-width: 100%;
    border: 1px solid #ccc;
    background: #fff;
}

button {
    padding: 12px 20px;
    background: #111;
    color: #fff;
    border: none;
    cursor: pointer;
}

#ptc-download {
    display: inline-block;
    margin-top: 10px;
    padding: 10px 15px;
    background: green;
    color: #fff;
    text-decoration: none;
}