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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <h1>JavaScript Calculator</h1>
<p class="warning">Don't divide by zero</p>

<div id="calculator" class="calculator">

  <button id="clear" class="clear">C</button>

  <div id="viewer" class="viewer">0</div>

  <button class="num" data-num="7">7</button>
  <button class="num" data-num="8">8</button>
  <button class="num" data-num="9">9</button>
  <button data-ops="plus" class="ops">+</button>

  <button class="num" data-num="4">4</button>
  <button class="num" data-num="5">5</button>
  <button class="num" data-num="6">6</button>
  <button data-ops="minus" class="ops">-</button>

  <button class="num" data-num="1">1</button>
  <button class="num" data-num="2">2</button>
  <button class="num" data-num="3">3</button>
  <button data-ops="times" class="ops">*</button>

  <button class="num" data-num="0">0</button>
  <button class="num" data-num=".">.</button>
  <button id="equals" class="equals" data-result="">=</button>
  <button data-ops="divided by" class="ops">/</button>
</div>

<button id="reset" class="reset">Reset Universe?</button>
            
          
!
            
              html {
  background: #100a1c;
  background-image:
    radial-gradient(50% 30% ellipse at center top, #201e40 0%, rgba(0,0,0,0) 100%),
    radial-gradient(60% 50% ellipse at center bottom, #261226 0%, #100a1c 100%);
  background-attachment: fixed;
  color: #6cacc5;
}

body {
  color: #6cacc5;
  font: 300 18px/1.6 "Source Sans Pro",sans-serif;
  margin: 0;
  padding: 5em 0 2em;
  text-align: center;
}

h1 {
  font-weight: 300;
  margin: 0;
}

/* Gradient text only on Webkit */
.warning {
  background: -webkit-linear-gradient(45deg,  #c97874 10%, #463042 90%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  color: #8c5059;
  font-weight: 400;
  margin: 0 auto 6em;
  max-width: 9em;
}

.calculator {
  font-size: 28px;
  margin: 0 auto;
  width: 10em;
  
  &::before,
  &::after {
    content: " ";
    display: table;
  }
  
  &::after {
    clear: both;
  }
}

/* Calculator after dividing by zero */
.broken {
  animation: broken 2s;
  transform: translate3d(0,-2000px,0);
  opacity: 0;
}

.viewer {
  color: #c97874;
  float: left;
  line-height: 3em;
  text-align: right;
  text-overflow: ellipsis;
  overflow: hidden;
  width: 7.5em;
  height: 3em;
}

button {
  border: 0;
  background: rgba(42,50,113, .28);
  color: #6cacc5;
  cursor: pointer;
  float: left;
  font: inherit;
  margin: 0.25em;
  width: 2em;
  height: 2em;
  transition: all 0.5s;
  
  &:hover {
    background: #201e40;
  }
  
  &:focus {
    outline: 0; // Better check accessibility

    /* The value fade-ins that appear */
    &::after {
      animation: zoom 1s;
      animation-iteration-count: 1;
      animation-fill-mode: both; // Fix Firefox from firing animations only once
      content: attr(data-num);
      cursor: default;
      font-size: 100px;
      position: absolute;
           top: 1.5em;
           left: 50%;
      text-align: center;
      margin-left: -24px;
      opacity: 0;
      width: 48px;    
    }
  }
}

/* Same as above, modified for operators */
.ops:focus::after {
  content: attr(data-ops);
  margin-left: -210px;
  width: 420px;
}

/* Same as above, modified for result */
.equals:focus::after {
  content: attr(data-result);
  margin-left: -300px;
  width: 600px;
}

/* Reset button */

.reset {
  background: rgba(201,120,116,.28);
  color:#c97874;
  font-weight: 400;
  margin-left: -77px;
  padding: 0.5em 1em;
  position: absolute;
    top: -20em;
    left: 50%;
  width: auto;
  height: auto;
  
  &:hover {
    background: #c97874;
    color: #100a1c;    
  }
  
  /* When button is revealed */
  &.show {
    top: 20em;
    animation: fadein 4s;
  }
}

/* Animations */

/* Values that appear onclick */
@keyframes zoom {
  0% { 
    transform: scale(.2); 
    opacity: 1;
  }
  
  70% { 
    transform: scale(1); 
  }
  
  100% { 
    opacity: 0;
  }
}

/* Division by zero animation */
@keyframes broken {
  0% {
    transform: translate3d(0,0,0);
    opacity: 1;
  }

  5% {
    transform: rotate(5deg);
  }

  15% {
    transform: rotate(-5deg);
  }

  20% {
    transform: rotate(5deg);
  }

  25% {
    transform: rotate(-5deg);
  }

  50% {
    transform: rotate(45deg);
  }

  70% {
    transform: translate3d(0,2000px,0);
    opacity: 1;
  }

  75% {
    opacity: 0;
  }

  100% {
    transform: translate3d(0,-2000px,0);
  }
}

/* Reset button fadein */
@keyframes fadein {
  0% {
    top: 20em;
    opacity: 0;
  }
  
  50% {
    opacity: 0;
  }
  
  100% {
    opacity: 1;
  }
}

@media (min-width: 420px) {
  .calculator {
    width: 12em;
  }
  .viewer {
    width: 8.5em;
  }
  button {
    margin: 0.5em;
  }
}
            
          
!
            
              /*
TODO:
    Limit number input
    Disallow . from being entered multiple times
    Clean up structure
*/

(function() {
  "use strict";

  // Shortcut to get elements
  var el = function(element) {
    if (element.charAt(0) === "#") { // If passed an ID...
      return document.querySelector(element); // ... returns single element
    }

    return document.querySelectorAll(element); // Otherwise, returns a nodelist
  };

  // Variables
  var viewer = el("#viewer"), // Calculator screen where result is displayed
    equals = el("#equals"), // Equal button
    nums = el(".num"), // List of numbers
    ops = el(".ops"), // List of operators
    theNum = "", // Current number
    oldNum = "", // First number
    resultNum, // Result
    operator; // Batman

  // When: Number is clicked. Get the current number selected
  var setNum = function() {
    if (resultNum) { // If a result was displayed, reset number
      theNum = this.getAttribute("data-num");
      resultNum = "";
    } else { // Otherwise, add digit to previous number (this is a string!)
      theNum += this.getAttribute("data-num");
    }

    viewer.innerHTML = theNum; // Display current number

  };

  // When: Operator is clicked. Pass number to oldNum and save operator
  var moveNum = function() {
    oldNum = theNum;
    theNum = "";
    operator = this.getAttribute("data-ops");

    equals.setAttribute("data-result", ""); // Reset result in attr
  };

  // When: Equals is clicked. Calculate result
  var displayNum = function() {

    // Convert string input to numbers
    oldNum = parseFloat(oldNum);
    theNum = parseFloat(theNum);

    // Perform operation
    switch (operator) {
      case "plus":
        resultNum = oldNum + theNum;
        break;

      case "minus":
        resultNum = oldNum - theNum;
        break;

      case "times":
        resultNum = oldNum * theNum;
        break;

      case "divided by":
        resultNum = oldNum / theNum;
        break;

        // If equal is pressed without an operator, keep number and continue
      default:
        resultNum = theNum;
    }

    // If NaN or Infinity returned
    if (!isFinite(resultNum)) {
      if (isNaN(resultNum)) { // If result is not a number; set off by, eg, double-clicking operators
        resultNum = "You broke it!";
      } else { // If result is infinity, set off by dividing by zero
        resultNum = "Look at what you've done";
        el('#calculator').classList.add("broken"); // Break calculator
        el('#reset').classList.add("show"); // And show reset button
      }
    }

    // Display result, finally!
    viewer.innerHTML = resultNum;
    equals.setAttribute("data-result", resultNum);

    // Now reset oldNum & keep result
    oldNum = 0;
    theNum = resultNum;

  };

  // When: Clear button is pressed. Clear everything
  var clearAll = function() {
    oldNum = "";
    theNum = "";
    viewer.innerHTML = "0";
    equals.setAttribute("data-result", resultNum);
  };

  /* The click events */

  // Add click event to numbers
  for (var i = 0, l = nums.length; i < l; i++) {
    nums[i].onclick = setNum;
  }

  // Add click event to operators
  for (var i = 0, l = ops.length; i < l; i++) {
    ops[i].onclick = moveNum;
  }

  // Add click event to equal sign
  equals.onclick = displayNum;

  // Add click event to clear button
  el("#clear").onclick = clearAll;

  // Add click event to reset button
  el("#reset").onclick = function() {
    window.location = window.location;
  };

}());
            
          
!
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