Untitled

<body>
  <div id="calc">
    <div class="top">
      <div id="output"></div>
      <div id="screen">0</div>
    </div>
    <div class="keys">
      <div class="key other" id="allClear">AC</div>
      <div class="key bracs">)</div>
      <div class="key bracs">(</div>
      <div class="key other" id="entryClear">CE</div>
      <div class="key operators">+</div>
      <div class="key operators">^</div>
      <div class="key" id="sqrt">√</div>
      <div class="key numbers" id="pi">π</div>
      <div class="key operators">-</div>
      <div class="key numbers">9</div>
      <div class="key numbers">8</div>
      <div class="key numbers">7</div>
      <div class="key operators">×</div>
      <div class="key numbers">6</div>
      <div class="key numbers">5</div>
      <div class="key numbers">4</div>
      <div class="key operators">÷</div>
      <div class="key numbers">3</div>
      <div class="key numbers">2</div>
      <div class="key numbers">1</div>
      <div class="key other" id="equals">=</div>
      <div class="key numbers">.</div>
      <div class="key numbers">0</div>
    </div>
  </div>
</body>