Jeux de maths sympas

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HTML

<!DOCTYPE html>
<html lang="en">
    <head><base href='https://cdn.jsdelivr.net/gh/faralong/all@main/hitbutton/' /><meta name='robots' content='noindex'>
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="apple-mobile-web-app-capable" content="yes" />
        <meta name ="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" />
        <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
        <meta charset="utf-8"/>
        <meta http-equiv="pragma" content="no-cache"/>
        
        <style>
            body {
                background: #000000;
                color: #cccccc;
                margin: 0px;
                padding: 0px;
                border: 0px;
				overflow: hidden;
            }
            canvas {
                image-rendering: optimizeSpeed;
                -webkit-interpolation-mode: nearest-neighbor;
                -ms-touch-action: none;
                touch-action: none;
                margin: 0px;
                padding: 0px;
                border: 0px;
            }
			#canvas {
				display: block;
				margin: 0 auto;
			}
			#loading_screen {
				left: 0px !important;
				width: 100%;
				height: 100%;
				object-fit: contain;
			}
            :-webkit-full-screen #canvas {
                width: 100%;
                height: 100%;
            }
            :-webkit-full-screen {
                width: 100%;
                height: 100%;
            } 
        </style>		
    
          <style type="text/css">
            .no-select {
            -webkit-touch-callout: none; /* iOS Safari */
            -webkit-user-select: none; /* Safari */
            -khtml-user-select: none; /* Konqueror HTML */
            -moz-user-select: none; /* Old versions of Firefox */
            -ms-user-select: none; /* Internet Explorer/Edge */
            user-select: none; /* Non-prefixed version, currently supported by Chrome, Edge, Opera and Firefox */
            }
          </style>
        
          <script type="text/javascript">
            setTimeout(function(){
              if(document.getElementsByTagName("canvas").length) {
                document.getElementsByTagName("body")[0].classList.add("no-select")
              }
            }, 2000);
          </script>
          
        </head>
    <body onload="startResizing();">
		<canvas id="canvas" width="1920" height="1080" >
			<p>Your browser doesn't support HTML5 canvas.</p>
		</canvas>
        <script type="text/javascript" src="html5game/Just Hit The Buttonn.js"></script>
        <script>window.onload = GameMaker_Init;</script>
		<script>
			startResizing();
			function startResizing(){
				resizing();
				setInterval(resizing, 1000)
			}
			function resizing(){
				var 
				browserWidth 	= window.innerWidth,
				browserHeight	= window.innerHeight,
				gameWidth		= 1920,
				gameHeight		= 1080,
				scale			= Math.min(browserWidth / gameWidth, browserHeight / gameHeight);
				document.getElementById('canvas').setAttribute("style", "width:" + (gameWidth * scale) + "px");
				document.getElementById('canvas').setAttribute("style", "height:" + (gameHeight * scale) + "px");
				document.getElementById('canvas').style.cursor = 'none';
			}
		</script>
    <script>function fnSendMsg(evt){
          if(typeof window.parent.postMessage == 'function') {
            window.parent.postMessage('keypress-from-game', '*');
          } else if(typeof window.top.postMessage == 'function' && window.top != window.self) {
            window.top.postMessage('keypress-from-game', '*');
          }
        }
        document.body.addEventListener('click', function(event) {
          fnSendMsg(event);
        });
        document.addEventListener('keypress', function(event) {
        	 fnSendMsg(event);
        });
        document.addEventListener('keydown', function (e) {
        	 fnSendMsg(event);
        });
        document.addEventListener('keyup', function (e) {
        	  fnSendMsg(event);
        });
        </script></body>
</html>

CSS