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HTML

              
                <body>
  <div class="calculator">
    
    <div id='entrybox' class='text-right'>
      <div id='entry'>
        <p id='answer'>0</p>
      </div>
      <div id='history'>
        <p>0</p>
      </div>
    </div> 
  
  
    <div class="row">
      <div class="container-fluid">
        <div class="col-xs-3">
          <div value="C" class="button">C</div>
          <div value="7" class="button">7</div>
          <div value="4" class="button">4</div>
          <div value="1" class="button">1</div>
          <div value="0" class="button">0</div>
        </div>
        <div class="col-xs-3">
          <div value="CE" class="button">CE</div>
          <div value="8" class="button">8</div>
          <div value="5" class="button">5</div>
          <div value="2" class="button">2</div>
          <div value="." class="button">.</div>
        </div>
        <div class="col-xs-3">
          <div value="%" class="button">%</div>
          <div value="9" class="button">9</div>
          <div value="6" class="button">6</div>
          <div value="3" class="button">3</div>
          <div value="=" class="button" id="equals">=</div>
        </div>
        <div class="col-xs-3">
          <div value="/" class="button">/</div>
          <div value="*" class="button">*</div>
          <div value="-" class="button">-</div>
          <div value="+" class="button">+</div>
        </div>
      </div>
    </div>
  </div>
</body>
              
            
!

CSS

              
                body {
  background: url(http://www.islamnews.ru/wp-content/uploads/2016/09/laptop-glasses-coffe-preview-850x565.jpg) no-repeat center center fixed;
  background-size: cover;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  padding-top: 50px;
  font-weight: bold;
}

.calculator {
  width: 250px;
  height: 380px;
  background: red;
  margin: 10px auto 50px;
  padding: 5px 10px;
  border-radius: 10px;
  background: #ececec;
  box-shadow: 1px 7px 10px 3px #000, inset 0 0 2px 0 #000;
  background-image: -webkit-repeating-linear-gradient(left, hsla(0, 0%, 100%, 0) 0%, hsla(0, 0%, 100%, 0) 6%, hsla(0, 0%, 100%, .1) 7.5%), -webkit-repeating-linear-gradient(left, hsla(0, 0%, 0%, 0) 0%, hsla(0, 0%, 0%, 0) 4%, hsla(0, 0%, 0%, .03) 4.5%), -webkit-repeating-linear-gradient(left, hsla(0, 0%, 100%, 0) 0%, hsla(0, 0%, 100%, 0) 1.2%, hsla(0, 0%, 100%, .15) 2.2%), linear-gradient(180deg, hsl(0, 0%, 78%) 0%, hsl(0, 0%, 85%) 47%, hsl(0, 0%, 78%) 53%, hsl(0, 0%, 70%)100%);
}

#entrybox {
  width: 200px;
  height: 80px;
  background: #999;
  margin: 15px;
  border: 1px solid #888;
  border-radius: 5px;
  text-align: right;
  padding-top: 3px;
  padding-right: 5px;
  overflow: hidden;
  background: -webkit-linear-gradient(top, #c9c7c7 0%, #999 100%);
  background: -linear-gradient(top, #c9c7c7 0%, #999 100%);
  background: -moz-linear-gradient(top, #c9c7c7 0%, #999 100%);
}

#entry {
  font-size: 30px;
}

.button {
  cursor: pointer;
  width: 40px;
  height: 30px;
  background: #a5a5a5;
  margin: 10px auto 20px auto;
  border-radius: 4px;
  padding-top: 5px;
  box-shadow: 0 1px 2px #000;
  border-bottom: 1px solid #555;
  -moz-transition: 0.1s;
  -webkit-transition: 0.1s;
  transition: 0.1s;
  position: relative;
  background: -webkit-linear-gradient(top, #c0c0c0 0%, #8f8f8f 100%);
  background: -linear-gradient(top, #c0c0c0 0%, #8f8f8f 100%);
  background: -moz-linear-gradient(top, #c0c0c0 0%, #8f8f8f 100%);
}

#equals{
  width:110px;
}

.button:hover {
  background: -webkit-linear-gradient(top, #c0c0c0 0%, #737373 100%);
  background: -linear-gradient(top, #c0c0c0 0%, #737373 100%);
  background: -moz-linear-gradient(top, #c0c0c0 0%, #737373 100%);
}

.button:active {
  border-bottom-width: 0;
  top: 1px;
}

.container-fluid {
  text-align: center;
}

.col-xs-3 {
  padding: 0;
}
              
            
!

JS

              
                $(document).ready(function(){
      
    var log= '';
    var ans= '';
    var entry= '';
    var current = '';
    var decimal = true;
    var reset = '';
  
  // round function if answer includes a decimal
  function round(val) {
    val = val.toString().split('');
    if (val.indexOf('.') !== -1) {
      var valTest = val.slice(val.indexOf('.') + 1, val.length);
      val = val.slice(0, val.indexOf('.') + 1);
      var i = 0;
      while (valTest[i] < 1) {
        i++
      }
      valTest = valTest.join('').slice(0, i + 2);
      if (valTest[valTest.length-1] === '0') {
        valTest = valTest.slice(0, -1);
      }
      return val.join('') + valTest;
    } else {
      return val.join('');
    }
  }

  $(".button").click(function(){
    
    entry = $(this).attr("value");
    console.log('entry: ' + entry);
    
    //reset for log after answer
    if (reset) {
      if (entry==='%' || entry === '/' || entry === '*' || entry === '-' || entry === '+') {
        log = ans;
      } else {
        ans = '';
      }
    }
    reset = false;
    
    //CLear all and clear entry
    if (entry === 'C' || entry === 'CE' && current === 'noChange') {
      ans = '';
      current = '';
      entry = '';
      log = '';
      $('#history').html('0');
      $('#answer').html('0');
      decimal = true;
    } else if (entry === 'CE') {
      $('#history').html(log.slice(0, -current.length));
      log = log.slice(0, -current.length);
      ans = ans.slice(0, -current.length);
      current = ans;
      if (log.length === 0 || log === ' ') {
        $('#history').html('0');
      }
      $('#answer').html('0');
      entry = '';
      decimal = true;
    }
    
    // prevents more than one deciminal in a number
    if (entry === '.' || entry === '0.') {
      if (!decimal) {
        entry = '';
      }
    }
    
    
    // digit combining
    while (Number(entry) || entry === '0' || current === '.') {

      if (isNaN(current) && entry === '0' && current !== '.') {
        entry = '';
      } else if (isNaN(current) && Number(entry) && current !== '.') {
        current = '';
      }
      if (entry === '.') {
        decimal = false;
      }
      if (current === '0.' && isNaN(entry)) {
        entry = '';
      } else {
        if (current[current.length - 1] === '.') {
          current = current.concat(entry);
        } else {
          current += entry;
        }
        ans += entry;
        $('#answer').html(current);
        log += entry;
        $('#history').html(log);
        entry = '';
      }
    }

    // Operation list
   if (entry === '.') {
      if (current === '' || isNaN(current[current.length - 1])) {
        current = '0.';
        ans += entry;
        $('#answer').html('0.');
        log += current;
        $('#history').html(log);

      } else {
        current = current.concat('.');
        ans = ans.concat('.');
        log = ans;
        $('#history').html(ans);
        $('#answer').html(current);
      }
      entry = '';
      decimal = false;

    } else if (entry === '%') {
      current = '%';
      ans = round(eval(ans)) + current;
      log += current;
      $('#history').html(log);
      $('#answer').html('%');
      entry = '';
      decimal = true;

    }else if (entry === '/') {
      current = '/';
      ans = round(eval(ans)) + current;
      log += current;
      $('#history').html(log);
      $('#answer').html('/');
      entry = '';
      decimal = true;

    } else if (entry === '*') {
      current = '*';
      ans = round(eval(ans)) + current;
      log += 'x';
      $('#history').html(log);
      $('#answer').html('x');
      entry = '';
      decimal = true;

    } else if (entry === '-') {
      current = '-';
      ans = round(eval(ans)) + current;
      log += current;
      $('#history').html(log);
      $('#answer').html('-');
      entry = '';
      decimal = true;

    } else if (entry === '+') {
      current = '+';
      ans = round(eval(ans)) + current;
      log += current;
      $('#history').html(log);
      $('#answer').html('+');
      entry = '';
      decimal = true;

    } else if (entry === '=') {
      if (current[current.length - 1] === '.') {
        entry = '';
      } else {
        current = eval(ans).toString();
        $('#answer').html(round(eval(ans)));
        ans = round(eval(ans));
        log += entry + ans;
        $('#history').html(log);
        log = ans;
        entry = '';
        reset = true;
        decimal = true;
      }
      current = 'noChange';
    }
    entry = '';

    if (reset) {
      log = '';
    }
    
    // max digits on screen
    if ($('#entry').children().text().length > 11 || $('#history').text().length > 23) {
      $('#answer').html('0');
      $('#history').html('Digit Limit Met');
      current = '';
      ans = '';
      log = '';
      decimal = true;
    }

    console.log('decimal: ' + decimal);
    console.log('current: ' + current);
    console.log('answer: ' + ans);
    console.log($('#history').text().length);

    
  });
});
              
            
!
999px

Console