*{padding:0;margin:0}body{overflow:hidden;background-color:gray;display:flex;justify-content:center;align-items:center;height:100vh;margin:0}canvas{image-rendering:pixelated;display:block;max-width:100vw;max-height:100vh;height:100%;width:auto;touch-action:none}button{top:30px;left:0;position:absolute}input{left:0;top:0;position:absolute}#fileInput{left:200px;top:0;position:absolute}