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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

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About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <html>
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1" />
  </head>
  <body>
 <div class="wrapper">
      <div class="box" id="buttons-left">Left Controls</div>
      <div class="box" id="game">Frame</div>
      <div class="box" id="buttons-right">Right Controls</div>
    </div>   
    <div id="root"></div>
  </body>
</html>
!

CSS 

              
                .wrapper {
  display: grid;
  grid-gap: 10px;
  grid-template-columns: 200px 1fr 200px;
  color: #444;
  position: absolute;
  width: 100%;
  height: 100%;
}
.box {
  font-family: Inter;
  font-size: 18px;
  color: #fff;
  border-radius: 10px;
  padding: 50px;
  font-size: 150%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #7f55d452;
  height: 100%;
}


## Drop default styles

.footer {
  position: absolute;
  display: flex;
  flex-wrap: wrap;
  flex-direction: column;
  align-items: start;
  background-color: #1f1f1f;
  color: white;
  justify-content: center;
  position: absolute;
  padding: 0px 16px;
  font-size: 10px;
  width: 100%;
  height: 12px;
  z-index: 1000;
  bottom: 0;
}

* {
  box-sizing: border-box;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}
/**
* 1. Add text decoration inheritance in all browsers (opinionated).
* 2. Add vertical alignment inheritance in all browsers (opinionated).
*/
::before,
::after {
  text-decoration: inherit; /* 1 */
  vertical-align: inherit; /* 2 */
}
/**
* 1. Use the default cursor in all browsers (opinionated).
* 2. Change the line height in all browsers (opinionated).
* 3. Use a 4-space tab width in all browsers (opinionated).
* 4. Remove the grey highlight on links in iOS (opinionated).
* 5. Prevent adjustments of font size after orientation changes in
*    IE on Windows Phone and in iOS.
* 6. Breaks words to prevent overflow in all browsers (opinionated).
*/
html {
  cursor: default; /* 1 */
  line-height: 1.5; /* 2 */
  tab-size: 4; /* 3 */
  -webkit-tap-highlight-color: transparent /* 4 */;
  word-break: break-word; /* 6 */
}
/* Sections
* ========================================================================== */
/**
* Remove the margin in all browsers (opinionated).
*/
* {
  margin: 0;
}
/**
* 1. Add the correct sizing in Firefox.
* 2. Show the overflow in Edge 18- and IE.
*/
hr {
  height: 0; /* 1 */
  overflow: visible; /* 2 */
}
/**
* Add the correct display in IE.
*/
main {
  display: block;
}
/**
* Remove the list style on lists in all browsers (opinionated).
*/
ol,
ul {
  list-style: none;
  padding: 0;
}

/* Text-level semantics
* ========================================================================== */
/**
* Remove the gray background on active links in IE 10.
*/
a {
  background-color: transparent;
}
/**
* Add the correct text decoration in Edge 18-, IE, and Safari.
*/
abbr[title] {
  text-decoration: underline;
  text-decoration: underline dotted;
}
/**
* Add the correct font weight in Chrome, Edge, and Safari.
*/
b,
strong {
  font-weight: bolder;
}
/**
* Add the correct font size in all browsers.
*/
small {
  font-size: 80%;
}
/* Embedded content
* ========================================================================== */
/*
* Change the alignment on media elements in all browsers (opinionated).
*/
audio,
canvas,
iframe,
img,
svg,
video {
  vertical-align: middle;
}
html,
body,
#__next {
  height: 100%;
}
img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}
/**
* Add the correct display in IE 9-.
*/
audio,
video {
  display: inline-block;
}
/**
* Add the correct display in iOS 4-7.
*/
audio:not([controls]) {
  display: none;
  height: 0;
}
/**
* Remove the border on iframes in all browsers (opinionated).
*/
iframe {
  border-style: none;
}
/**
* Remove the border on images within links in IE 10-.
*/
img {
  border-style: none;
}
/**
* Change the fill color to match the text color in all browsers (opinionated).
*/
svg:not([fill]) {
  fill: currentColor;
}
/**
* Hide the overflow in IE.
*/
svg:not(:root) {
  overflow: hidden;
}
/* Tabular data
* ========================================================================== */
/**
* Collapse border spacing in all browsers (opinionated).
*/
table {
  border-collapse: collapse;
}
/* Forms
* ========================================================================== */
/**
* 1. Show the overflow in IE.
* 2. Remove the inheritance of text transform in Edge 18-, Firefox, and IE.
*/
button {
  overflow: visible; /* 1 */
  text-transform: none; /* 2 */
}
/**
* Correct the inability to style buttons in iOS and Safari.
*/
button,
[type='button'],
[type='reset'],
[type='submit'] {
  appearance: button;
}
/**
* 1. Change the inconsistent appearance in all browsers (opinionated).
* 2. Correct the padding in Firefox.
*/
fieldset {
  border: 1px solid #a0a0a0; /* 1 */
  padding: 0.35em 0.75em 0.625em; /* 2 */
}
/**
* Show the overflow in Edge 18- and IE.
*/
input {
  overflow: visible;
}
/**
* 1. Correct the text wrapping in Edge 18- and IE.
* 2. Correct the color inheritance from 'fieldset' elements in IE.
*/
legend {
  color: inherit; /* 2 */
  display: table; /* 1 */
  max-width: 100%; /* 1 */
  white-space: normal; /* 1 */
}
/**
* 1. Add the correct display in Edge 18- and IE.
* 2. Add the correct vertical alignment in Chrome, Edge, and Firefox.
*/
progress {
  display: inline-block; /* 1 */
  vertical-align: baseline; /* 2 */
}
/**
* Remove the inheritance of text transform in Firefox.
*/
select {
  text-transform: none;
}
/**
* 1. Remove the margin in Firefox and Safari.
* 2. Remove the default vertical scrollbar in IE.
* 3. Change the resize direction in all browsers (opinionated).
*/
textarea {
  overflow: auto; /* 2 */
  resize: vertical; /* 3 */
}
/**
* Remove the padding in IE 10-.
*/
[type='checkbox'],
[type='radio'] {
  padding: 0;
}
/**
* 1. Correct the odd appearance in Chrome, Edge, and Safari.
* 2. Correct the outline style in Safari.
*/
[type='search'] {
  appearance: textfield; /* 1 */
  outline-offset: -2px; /* 2 */
}
/**
* Correct the cursor style of increment and decrement buttons in Safari.
*/
::-webkit-inner-spin-button,
::-webkit-outer-spin-button {
  height: auto;
}
/**
* Correct the text style of placeholders in Chrome, Edge, and Safari.
*/
::-webkit-input-placeholder {
  color: inherit;
  opacity: 0.54;
}
/**
* Remove the inner padding in Chrome, Edge, and Safari on macOS.
*/
::-webkit-search-decoration {
  appearance: none;
}
/**
* 1. Correct the inability to style upload buttons in iOS and Safari.
* 2. Change font properties to 'inherit' in Safari.
*/
::-webkit-file-upload-button {
  appearance: button; /* 1 */
  font: inherit; /* 2 */
}
/**
* Remove the inner border and padding of focus outlines in Firefox.
*/
::-moz-focus-inner {
  border-style: none;
  padding: 0;
}
/**
* Restore the focus outline styles unset by the previous rule in Firefox.
*/
:-moz-focusring {
  outline: 1px dotted ButtonText;
}
/**
* Remove the additional :invalid styles in Firefox.
*/
:-moz-ui-invalid {
  box-shadow: none;
}
/* Interactive
* ========================================================================== */
/*
* Add the correct display in Edge 18- and IE.
*/
details {
  display: block;
}
/*
* Add the correct display in all browsers.
*/
summary {
  display: list-item;
}
/* Scripting
* ========================================================================== */
/**
* Add the correct display in IE 9-.
*/
canvas {
  display: inline-block;
}
/**
* Add the correct display in IE.
*/
template {
  display: none;
}
/* User interaction
* ========================================================================== */
/*
* 1. Remove the tapping delay in IE 10.
* 2. Remove the tapping delay on clickable elements
      in all browsers (opinionated).
*/
a,
area,
button,
input,
label,
select,
summary,
textarea,
[tabindex] {
  touch-action: manipulation; /* 1 2 */
}
/* Accessibility
* ========================================================================== */
/**
* Change the cursor on busy elements in all browsers (opinionated).
*/
[aria-busy='true'] {
  cursor: progress;
}
/*
* Change the cursor on control elements in all browsers (opinionated).
*/
[aria-controls] {
  cursor: pointer;
}
/*
* Change the cursor on disabled, not-editable, or otherwise
* inoperable elements in all browsers (opinionated).
*/
[aria-disabled='true'],
[disabled] {
  cursor: not-allowed;
}
/*
* Change the display on visually hidden accessible elements
* in all browsers (opinionated).
*/
[aria-hidden='false'][hidden] {
  display: initial;
}
[aria-hidden='false'][hidden]:not(:focus) {
  clip: rect(0, 0, 0, 0);
  position: absolute;
}
!

JS
!
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