body{
    margin: 40px auto;
    padding: 10px;
    max-width: 800px;
    font-family: -apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif,Apple Color Emoji,Segoe UI Emoji;
}

figure{
    text-align: center;   
}

h1, h2, h3, h4, h5, h6 {
    border-left: 5px solid;
    padding-left: 15px;
    border-color: #5472d3;
}

canvas{
    display: block;
    margin: 10px auto;
}