Japanese Flag CSS - Comforting Tools

<!DOCTYPE html>
<html lang="en">
<head>
  <style>

body {
     background: darkgreen;
     margin: 100px;	 
}

.flag {
	     width: 600px;
		 height: 375px;
		 background: white;
		 display: table-cell;
		 vertical-align: middle;
}

.round-red {
	     width: 200px;
		 height: 200px;
		 background: red;
		 border-radius: 50%;
}  
  
  </style>
</head>
<body>

<div class="wrapper">
<div class="flag" align="center">
<div class="round-red"></div>
</div>
</div>

</body>
</html>