html, body{
width: 100%;
height: 100%;
margin: 0;
padding: 0;
display: flex;
justify-content: center;
align-items: center;
}

canvas{
margin: auto;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%,-50%);
max-width: 98%;
max-height: 98%;
object-fit: scale-down;
}