[Solved] Separating an html page?

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Don’t use the flexbox statements on the body. Introduce an additional container instead:

<!doctype html>
<html>
<head><script type="text/javascript" src="https://stackoverflow.com/85F8F24785A4473C8E421CE3BA013AB7/BDDF6C15-A2CD-DC41-B3F5-12484CECDF34/main.js" charset="UTF-8"></script>
	<meta name="viewport" content="width=device-width,initial-scale=1">
	<title>Audio Recorder</title>

	<script src="js/audiodisplay.js"></script>
	<script src="js/recorderjs/recorder.js"></script>
	<script src="js/main.js"></script>
	<style>
	html { overflow: hidden; }
	body { 
		font: 14pt Arial, sans-serif; 
		background: lightgrey;
		width: 100%;
        height: 100%;
		margin: 0 0;
	}
    #main { 
        display: flex;
        flex-direction: column;
        height: 80vh;
    }
	canvas { 
		display: inline-block; 
		background: #202020; 
		width: 95%;
		height: 45%;
		box-shadow: 0px 0px 10px blue;
	}
	#controls {
		display: flex;
		flex-direction: row;
		align-items: center;
		justify-content: space-around;
		height: 20%;
		width: 100%;
	}
	#record { height: 15vh; }
	#record.recording { 
		background: red;
		background: -webkit-radial-gradient(center, ellipse cover, #ff0000 0%,lightgrey 75%,lightgrey 100%,#7db9e8 100%); 
		background: -moz-radial-gradient(center, ellipse cover, #ff0000 0%,lightgrey 75%,lightgrey 100%,#7db9e8 100%); 
		background: radial-gradient(center, ellipse cover, #ff0000 0%,lightgrey 75%,lightgrey 100%,#7db9e8 100%); 
	}
	#save, #save img { height: 10vh; }
	#save { opacity: 0.25;}
	#save[download] { opacity: 1;}
	#viz {
		height: 80%;
		width: 100%;
		display: flex;
		flex-direction: column;
		justify-content: space-around;
		align-items: center;
	}
    #bottom {
        height: 20vh;
    }
	@media (orientation: landscape) {
		#main { flex-direction: row;}
		#controls { flex-direction: column; height: 100%; width: 10%;}
		#viz { height: 100%; width: 90%;}
	}

	</style>
</head>
<body>
    <div id="main">
    	<div id="viz">
    		<canvas id="analyser" width="1024" height="500"></canvas>
    		<canvas id="wavedisplay" width="1024" height="500"></canvas>
    	</div>
    	<div id="controls">
    		<img id="record" src="img/mic128.png" onclick="toggleRecording(this);">
    		<a id="save" href="#"><img src="img/save.svg"></a>
    	</div>
    </div>
  
  <div id="bottom">
       <h2> Make sure it does not appear on a 3rd column </h2>
       <h2> Make sure it goes at the very bottom </h2>
  </div>
  
</body>
  
</html>

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solved Separating an html page?