<!doctype html>
<html>
<head lang="sv"></head>
<body>
<h1>M1 | 03</h1>
<form action="calculate.php" method="post">
<fieldset>
<legend>Calculator</legend>
<input type="number" name="n1"> +
<input type="number" name="n2">
<br>
<input type="submit" value="Calculate">
</fieldset>
</form>
</body>