index.html

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width">
	<title>Random calculator</title>
	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/4.2.0/normalize.min.css">
	<link rel="stylesheet" href="calculator.css">
</head>
<body>
		<a href="https://github.com/bullgit/random-calculator" class="github-corner"><svg width="80" height="80" viewBox="0 0 250 250" style="fill:#151513; color:#fff; position: absolute; top: 0; border: 0; right: 0;"><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path></svg></a><style>.github-corner:hover .octo-arm{animation:octocat-wave 560ms ease-in-out}@keyframes octocat-wave{0%,100%{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}@media (max-width:500px){.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:octocat-wave 560ms ease-in-out}}</style>

	<div class="text">
		<h1>The random calculator<sup>®</sup></h1>
		<p>Need to report your monthly expenses? Want to know the sum of your pay raises of the last decade? Like to calculate your daily calories on your current diet?</p>
		<p>We’ve got you covered:</p>
	</div>

	<main>
		<output>0</output>
		<div class="button-row">
			<button type="button" data-action="clear" class="meta">C</button>
			<button type="button" data-action="sign" class="meta plus-minus">
				<span class="plus">+</span>
				&frasl;
				<span class="minus">&ndash;</span>
			</button>
			<button type="button" data-action="percent" class="meta">%</button>
			<button type="button" data-action="divide" class="operator">÷</button>
		</div>
		<div class="button-row">
			<button type="button" data-number="7">7</button>
			<button type="button" data-number="8">8</button>
			<button type="button" data-number="9">9</button>
			<button type="button" data-action="multiply" class="operator">×</button>
		</div>
		<div class="button-row">
			<button type="button" data-number="4">4</button>
			<button type="button" data-number="5">5</button>
			<button type="button" data-number="6">6</button>
			<button type="button" data-action="subtract" class="operator">&ndash;</button>
		</div>
		<div class="button-row">
			<button type="button" data-number="1">1</button>
			<button type="button" data-number="2">2</button>
			<button type="button" data-number="3">3</button>
			<button type="button" data-action="add" class="operator">+</button>
		</div>
		<div class="button-row">
			<button type="button" data-number="0" class="zero">0</button>
			<button type="button" data-action="float">.</button>
			<button type="button" data-action="equal" class="operator">=</button>
		</div>
	</main>
	<script src="calculator.js"></script>
</body>
</html>