Calculator

<div class="container-fluid">

  <div class="row-fluid col-sm-8 col-sm-offset-2 col-md-6 col-md-offset-3">

    <div class="display col-xs-12">

      <div class="row">

        <span class="col-xs-12 br"><h1> 0</h1></span> 

      </div>

    </div>

    <div class="topOperations col-xs-12">

      <div class="row">

        <span class="col-xs-3">AC</span> 

        <span class="col-xs-3">CE</span> 

        <span class="col-xs-3">%</span> 

        <span style="background-color: tomato;" class="col-xs-3 br">÷</span> 

      </div>

    </div>

    <div class="numbers col-xs-9">

      <div class="row">

        <span class="col-xs-4">1</span>

        <span class="col-xs-4">2</span>

        <span class="col-xs-4">3</span>

        <span class="col-xs-4">4</span>

        <span class="col-xs-4">5</span>

        <span class="col-xs-4">6</span>

        <span class="col-xs-4">7</span>

        <span class="col-xs-4">8</span>

        <span class="col-xs-4">9</span>

        <span class="col-xs-8 bb">0</span>

        <span class="col-xs-4 bb">.</span>

      </div>

    </div>

    <div class="operations col-xs-3">

      <div class="row">

        <span class="col-xs-12 br">x</span>

        <span class="col-xs-12 br">-</span>

        <span class="col-xs-12 br">+</span>

        <span id="equals" class="col-xs-12 br bb">=</span>

      </div>

    </div>

  </div>

</div>

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