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<!doctype html>
<html lang="ko">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
#page {margin: 0 auto; background-color: antiquewhite; width: 500px; text-align: center;}
#num1, #num2 {width: 30px;}
.calc {width: 100px; height: 50px;}
</style>
</head>
<body>
<div id="page">
<h2>Calculator</h2>
<form action="form_calc_server.php" method="post">
<input type="text" name="num1" id="num1">
<select name="op" id="op">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">X</option>
<option value="/">%</option>
</select>
<input type="text" name="num2" id="num2"><br><br>
<button class="calc" type="submit">Calc</button>
</form>
</div>
</body>
</html>