cssAudio - Activefile-genericCSS - ActiveGeneric - ActiveHTML - ActiveImage - ActiveJS - ActiveSVG - ActiveText - Activefile-genericVideo - ActiveLovehtmlicon-new-collectionicon-personicon-teamlog-outoctocatpop-outspinnerstartv

Pen Settings

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

Code Indentation


Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

              <div class="calculator">

  <!-- the input -->
  <input type="number">

  <!-- the buttons -->
  <div class="calculator-buttons">
    <button class="calc-button is-clear">C</button>
    <button class="calc-button">&divide;</button>

    <button class="calc-button">7</button>
    <button class="calc-button">8</button>
    <button class="calc-button">9</button>
    <button class="calc-button">&times;</button>

    <button class="calc-button">4</button>
    <button class="calc-button">5</button>
    <button class="calc-button">6</button>
    <button class="calc-button">&minus;</button>

    <button class="calc-button">1</button>
    <button class="calc-button">2</button>
    <button class="calc-button">3</button>
    <button class="calc-button">&plus;</button>

    <button class="calc-button is-zero">0</button>
    <button class="calc-button is-equals">&equals;</button>
              @import url('https://fonts.googleapis.com/css?family=Space+Mono');

/* quick reset so all our padding is the right size */
* {
  box-sizing: border-box;

.calculator input,
.calc-button   {
  font-family: 'Space Mono';

/* add some spacing */
body          {
  background: #F6F6F6;
  padding-bottom: 30px;
  padding-top: 30px;  

/* limit the width and center */
.calculator   {
  max-width: 400px;
  margin: 0 auto;
  border: 2px solid #111;
  border-radius: 5px;

.calculator input   {
  /* reset basic form styles */
  background: none;
  border: none;
  box-shadow: none;
  outline: none;

  padding: 20px 10px;
  width: 100%;
  border-bottom: 2px solid #111;
  color: #333;
  text-align: right;
  font-size: 40px;
  border-radius: 0;

.calc-button  {
  background: rgba(0, 0, 0, 0.5); /* light background with opacity 50% */
  border: 1px solid #111; /* black border */
  padding: 20px;
  color: #EEE; /* white text */
  border-radius: 5px; /* rounded corners */
  font-size: 22px; /* larger fonts */
  cursor: pointer; /* make it look clickable */

.calculator-buttons {
  /* small spacing within our container */
  padding: 20px;

  /* the grid stuff! */
  display: grid;

  /* create 4 columns */
  grid-template-columns: 1fr 1fr 1fr 1fr;

  /* add the grid gap */
  grid-gap: 15px;

/* span across 3 columns */
.is-clear   {
  grid-column: span 3;

/* go blue */
.is-clear   {
  background: #3572DB;

.is-equals {
  background: #28D060;
🕑 One or more of the npm packages you are using needs to be built. You're the first person to ever need it! We're building it right now and your preview will start updating again when it's ready.
Loading ..................