Pen Settings



CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

+ add another resource


Babel includes JSX processing.

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


Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.


Auto Save

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.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.


                <h2>Creating Curly Brackets with SCSS</h2>
<div class="example curly-bracket-top">Top</div>
<div class="example curly-bracket-bottom">Bottom</div>
<div class="example curly-bracket-left">Left</div>
<div class="example curly-bracket-right">Right</div>


                /* An element in the shape of a triangle
 * $base Width of the border at the base of the triangle (i.e. border opposite direction)
 * $left Width of the border to the left of the base
 * $right Width of the border to the right of the base
 * $dir Direction of the primary apex of the triangle [top|right|bottom|left]
 * $colour Colour of the shape
@mixin triangle($base: 1, $left: 1, $right: 1, $colour: black, $dir: top) {
  // Possible triangle orientations
  $dirs: (
    top: (bottom, left, right),
    right: (left, top, bottom),
    bottom: (top, right, left),
    left: (right, bottom, top)
  // Check if a correct orientation has been passed
  @if map-has-key($dirs, $dir) {} @else {
    @error "@mixin triangle requires a valid direction. E.g. top, right, bottom, left";
  width: 0;
  height: 0;
  border-#{nth(map-get($dirs, $dir), 1)}: $base solid $colour;
  border-#{nth(map-get($dirs, $dir), 2)}: $left solid transparent;
  border-#{nth(map-get($dirs, $dir), 3)}: $right solid transparent;

/* Cross-vendor border radius
@mixin border-radius($val: 0) {
  -webkit-border-radius: $val;
     -moz-border-radius: $val;
       -o-border-radius: $val;
          border-radius: $val;

/* For making a curly bracket around a dom element - only one mind
 * $radius Radius of the bend at the curly parts of the bracket
 * $w Width of the bracket path
 * $h Height of the middle outward segment
 * $colour Colour of the bracket
 * $bg Background colour of the parent element(s)
 * $dir Which side of the element to add bracket [top|bottom]
 * @note Target element must be careful with the ::before/::after pseudo elements.
@mixin curly-brackets($radius, $w, $h, $colour, $bg, $dir) {
  // Check if a correct orientation has been passed
  @if $dir == top or $dir == right or $dir == bottom or $dir == left {} @else {
    @error "@mixin curly-brackets requires a valid direction. E.g. top, right, bottom, left";
  width: 100%;
  height: 3 * $radius / 2;
  border-#{$dir}: $w solid $colour;
  @include border-radius($radius);
  position: relative;
  &::before, &::after {
    content: "";
    margin: auto;
    position: absolute;
    @if $dir == top or $dir == bottom { left: 0; right: 0; }
    @if $dir == right or $dir == left { top: 0; bottom: 0; }
  &::before {
    #{$dir}: -$h - $w / 2;
    @include triangle($h, $h, $h, $colour, $dir);
  &::after {
    #{$dir}: -$h + $w;
    @include triangle($h, $h, $h, $bg, $dir);

/* Example usage

$bracket-colour: red;
$bg-colour: white;
$dirs: top right bottom left;

@each $dir in $dirs {
  .curly-bracket-#{$dir} {
    @include curly-brackets(9px, 3px, 12px, $bracket-colour, $bg-colour, #{$dir});

.example {
  width: 128px;
  height: 96px;
  margin: 12px;
  padding: 12px;
  display: inline-block;
  vertical-align: middle;

body { text-align: center; }