*{ margin: 0; padding: 0; box-sizing: border-box; } 
html, body { width: 100%; height: 100%; overflow: hidden; position: fixed; }
main {text-align: center;width: 100%;}
canvas {display: block; position: absolute;}
main {align-items: center;display: flex;height: 100vh;justify-content: center;}
main canvas { height: auto !important;width: auto !important;max-width: 100%;max-height: 100%;display: inline-block;margin: 0 auto;vertical-align: middle;touch-action: none;}