basic-calculator/index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>HTML 5 Boilerplate</title>
    <link rel="stylesheet" href="style.css">
  </head>
  <body>
    <div id="calculatorContainer">
    <div class="calc-output">0</div>
    <div class="calc-row">
      <button type="clear" class="action">C</button>
      <button type ="backspace" class="action">&#11013;</button>
      <button type="division" class="operation">÷</button>
    </div>
    <div class="calc-row">
      <button type="number">7</button>
      <button type="number">8</button>
      <button type="number">9</button>
      <button type="multiplication" class="operation">×</button>
    </div>
    <div class="calc-row">
      <button type="number">4</button>
      <button type="number">5</button>
      <button type="number">6</button>
      <button type="subtraction" class="operation">-</button>
    </div> 
    <div class="calc-row">
      <button type="number">1</button>
      <button type="number">2</button>
      <button type="number">3</button>
      <button type="addition" class="operation">+</button>
    </div>
    <div class="calc-row">
      <button type="number">0</button>
      <button type="perform">=</button>
    </div>   
  </div>
	<script src="index.js"></script>
  </body>
</html>