html,body {
    padding: 0;
    margin: 0;
    background-color: rgb(220,120,220);
    background-image: url("bg.jpg");
    
}
canvas {
    padding-left: 0;
    padding-right: 0;
    margin-left: auto;
    margin-right: auto;
    margin-top: 20px;
    display: block;
}