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HTML

              
                <div class="calculator">
  <div class="display">0</div>
  <div class="upper-keypad">
    <button class="black fx normal" value="pow">x<sup>y</sup></button>
    <button class="black fx normal" value="log">LOG</button>
    <button class="black fx normal" value="ln">LN</button>
    <button class="black fx normal" value="exp">e<sup>x</sup></button>
    <button class="blue fx normal" value="clr">CLR</button>
    
    <button class="black fx normal" value="sqrt">√x</button>
    <button class="black fx normal" value="arc">ARC</button>
    <button class="black fx normal" value="sin">SIN</button>
    <button class="black fx normal" value="cos">COS</button>
    <button class="black fx normal" value="tan">TAN</button>
    
    <button class="black fx normal" value="inv">1/x</button>
    <button class="black fx normal" value="swap">x⇄y</button>
    <button class="black fx normal" value="roll">R⬇</button>
    <button class="black fx normal" value="sto">STO</button>
    <button class="black fx normal" value="rcl">RCL</button>
    
    <button class="blue fx wide" value="enter">ENTER ⬆</button>
    <button class="black fx normal" value="chs">CHS</button>
    <button class="black fx normal" value="eex">EEX</button>
    <button class="black fx normal" value="clx">CLx</button>
  </div>
  <div class="lower-keypad">
    <button class="blue fx normal" value="-">&minus;</button>
    <button class="white num normal" value="7">7</button>
    <button class="white num normal" value="8">8</button>
    <button class="white num normal" value="9">9</button>
    
    <button class="blue fx normal" value="+">+</button>
    <button class="white num normal" value="4">4</button>
    <button class="white num normal" value="5">5</button>
    <button class="white num normal" value="6">6</button>
    
    <button class="blue fx normal" value="*">×</button>
    <button class="white num normal" value="1">1</button>
    <button class="white num normal" value="2">2</button>
    <button class="white num normal" value="3">3</button>
    
    <button class="blue fx normal" value="/">÷</button>
    <button class="white num normal" value="0">0</button>
    <button class="white num normal" value=".">.</button>
    <button class="white num normal" value="pi">π</button>
    
  </div>
  <div class="stack-preview">
    <div>T: <span id="T"></span></div>
    <div>Z: <span id="Z"></span></div>
    <div>Y: <span id="Y"></span></div>
    <div>X: <span id="X"></span></div>
    <div>S: <span id="S"></span></div>
    <div>xdone: <span id="xdone"></span></div>
    <div>enter: <span id="enter"></span></div>
    <div>minus: <span id="minus"></span></div>
  </div>
</div>
<span>
  <img id="backlabel" src="http://www.keesvandersanden.nl/calculators/images/HP35_1302S48386_backlabel.jpg">
</span>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Inconsolata|Source+Sans+Pro&subset=greek,latin-ext');

.calculator {
  border: 2px solid black;
  width: 300px;
  margin: 20px auto;
  padding: 10px;
  background-color: #4C474B;
  
  .display {
    border: 2px solid black;
    background-color: #4D0512;
    color: red;
    margin: 10px 5px;
    margin-bottom: 20px;
    padding: 10px 20px;
    font-size: 24px;
    font-family: Inconsolata, Consolas, monospace;
    text-overflow: clip;
    // text-align: right;
    
  }
  
  .upper-keypad {
    display: grid;
    grid-template: repeat(4, 1fr) / repeat(5, 1fr);
    
  }
  
  .lower-keypad {
    display: grid;
    grid-template: repeat(4, 1fr) / repeat(4, 1fr);
    
    .num {color: black}
  }
  
  .upper-keypad, .lower-keypad {
    button {
      display: flex;
      padding: 10px;
      margin: 5px;
      color: white;
      justify-content: center;
      border: 0;
      border-radius: 4px;
      font-family: Source Sans Pro, sans-serif;
      font-size: 18px;
      cursor: pointer;
    }
  }
  
  $black: #222222;
  $blue: #5EB6C4;
  $white: #FDFEEE;
  
  .black {background-color: $black;
    &:hover {
      background-color: darken($black, 10%);
    } 
  }
  .blue {
    background-color: $blue;
    &:hover {
      background-color: darken($blue, 10%);
    }
  }
  .white {
    background-color: $white;
    &:hover {
      background-color: darken($white, 10%);
    } 
  }
  
  .enabled {
    border: 1px solid white;
    background-color: lighten($black, 20%);
    &:hover {
      background-color: lighten($black, 40%);
    } 
  }
  
  .normal {grid-area: auto / span 1;}
  .wide {grid-area: auto / span 2;}
  
  .stack-preview {
    font-family: Inconsolata, Consolas, monospace;
    color: white;
    display: none;    // comment out this line for debugging
  }
}

#backlabel {
  margin: auto;
  display: block;
}
              
            
!

JS

              
                $('.calculator').each(function() {
  let calculator = $(this);
  let display = $('.display');
  let stack = {
    'x': 0,  // display register
    'y': 0,
    'z': 0,
    't': 0,
    's': 0  // storage register
  };
  let arc = false;
  let xdone = true;   // if false, entry for x is not yet done
  let enter = false;  // if true, does not immediately lift stack
  let minus = true;   // if true, allow direct entry of (-) sign
  let error = false;
  let manual_update = false;  // if true, update() is overriden
  
  let funcs = {
    'pow': (x,y) => Math.pow(x,y),
    'log': (x) => Math.log10(x),
    'ln': (x) => Math.log(x),
    'exp': (x) => Math.exp(x),
    'sqrt': (x) => Math.sqrt(x),
    'sin': (x) => (arc ? Math.asin(x)*180/Math.PI : Math.sin(x*Math.PI/180)),
    'cos': (x) => (arc ? Math.acos(x)*180/Math.PI : Math.cos(x*Math.PI/180)),
    'tan': (x) => (arc ? Math.atan(x)*180/Math.PI : Math.tan(x*Math.PI/180)),
    'inv': (x) => 1/x,
    '+': (x,y) => (y|0)+(x|0),
    '-': (x,y) => y-x,
    '*': (x,y) => y*x,
    '/': (x,y) => y/x
  };
  
  let update = function() {
    if (stack.x === '-') {
      display.html('-0');
    }
    else if (isNaN(stack.x) || !isFinite(stack.x)) {
      display.html('error')
    }
    else display.html(stack.x);
    
    if (arc) {
      $('button[value="arc"]').addClass('enabled');
    } else {
      $('button[value="arc"]').removeClass('enabled');
    }
    
    $('#T').html(stack.t);
    $('#Z').html(stack.z);
    $('#Y').html(stack.y);
    $('#X').html(stack.x);
    $('#S').html(stack.s);
    $('#xdone').html(xdone);
    $('#enter').html(enter);
    $('#minus').html(minus);
  }

  let keys = $('.upper-keypad, .lower-keypad', calculator);
  $('.fx', keys).click(function() {
    let fn = $(this).val();
    switch (fn) {
      case 'enter':
        stack.t = stack.z;
        stack.z = stack.y;
        stack.y = stack.x;
        enter = true;
        break;
      case 'swap':
        let x = stack.x, y = stack.y;
        stack.x = y;
        stack.y = x;
        break;
      case 'roll':
        let oldt = stack.t;
        stack.t = stack.x;
        stack.x = stack.y;
        stack.y = stack.z;
        stack.z = oldt;
        break;
      case 'clr':
        stack.t = 0;
        stack.x = 0;
        stack.y = 0;
        stack.z = 0;
        stack.s = 0;
        minus = true;
        break;
      case 'chs':
        if (minus) {
          if (xdone) {
            stack.x = '-';
            xdone = false;
            // console.log('   xdone: ' + xdone);
          } else stack.x += '-';
          minus = false;
        } else {
          stack.x = -parseFloat(stack.x);
        }
        break;
      case 'eex':
        minus = true;
        xdone = false;
        if (stack.x === 0) stack.x = 1;
        stack.x += 'e';
        break;
      case 'clx':
        stack.x = 0;
        minus = true;
        xdone = true;
        break;
      case 'sto':
        stack.s = stack.x;
        break;
      case 'rcl':
        if (!enter) {
          stack.t = stack.z;
          stack.z = stack.y;
          stack.y = stack.x;
        }
        stack.x = stack.s;
        break;
      case 'arc':
        arc = true;
        break;
      default:
        let twoargs = ['pow', '+', '-', '*', '/'];
        let trig = ['sin', 'cos', 'tan'];
        if (twoargs.indexOf(fn) !== -1) { // if fn needs 2 args
          stack.x = funcs[fn](stack.x, stack.y);
          stack.y = stack.z;
          stack.z = stack.t;
        } else {
          stack.x = funcs[fn](stack.x);
          // following any trig function
          // z is duplicated into register T
          if (trig.indexOf(fn) !== -1) {
            stack.t = stack.z;
          }
        }
        if (arc) arc = false;
        break;
    }
    if (['chs','eex','clx'].indexOf(fn) === -1) xdone = true;
    update();
  });

  $('.num', keys).click(function() {
    let n = $(this).val();
    if (n === 'pi') {
      stack.t = stack.z;
      stack.z = stack.y;
      stack.y = stack.x;
      stack.x = Math.PI;
      enter = false;
    } else if (n === '.') {
      stack.x += n;
    } else {
      if (xdone) {
        if (!enter) {
          stack.t = stack.z;
          stack.z = stack.y;
          stack.y = stack.x;
        }
        stack.x = parseFloat(n);
        xdone = false;
        enter = false;
      } else {
        stack.x += '' + n;
      }
    }
    minus = false;
    update();
  });
});

              
            
!
999px

Console