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. You can use the CSS from another Pen by using it's URL and the proper URL extention.

+ 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.


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.

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.


                <div class="example">
  <div class="example__ball"></div>
  <h1 class="example__title">Taiwan No.1!</h1>
  <button onclick="animateCircle()"> Build! </button>



                $main-color: #1a528b;
$bg-color: beige;
$shadow-color: rgba(0, 0, 0, .5);
* {
  box-sizing: border-box;

*:before, *:after {
  box-sizing: inherit;

body {
  height: 100vh;
  width: 100%;
  overflow-x: hidden;

.example {
  height: 100%;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  background-color: $bg-color;

.example__ball {
  height: 300px;
  width: 300px;
  position: relative;
  border-radius: 50%;
  background-color: $main-color;
  box-shadow: 5px 2px 60px $shadow-color;

.example__title {
  text-align: center;
  position: absolute;
  top: 45%;
  transform: translateY(-45%);
  color: lighten($main-color, 50);
  text-shadow: 3px 3px 3px $shadow-color;

.example button {
  position: fixed;
  bottom: 20%;
  left: 50%;
  transform: translateX(-50%);
  background: #000;
  color: #fff;


                function animateCircle() {
 // 使用 TimelineMax 物件
const tl = new TimelineMax();
// 利用 .set 設定擁有 class name .example__title 的元素
// 將其 scale 縮小成 0.2,透明度設為 0
  .set(".example__title", {
    scale: 0.2,
    autoAlpha: 0
  // 將擁有 class name .example__ball 的元素
  // scale 縮小成 0.2
  .set(".example__ball", {
    scale: 0.2
  // tween 1: 在 1 秒內旋轉 360 度,並翻轉 180 度
  // 接著回復 scale 成原始大小,中間以 Elastic.easeIn 這個 ease function 來控制動畫速度
  .to(".example__ball", 1, {
    rotationX: 360,
    rotationY: 180,
    scale: 1,
    ease: Elastic.easeIn.config(2, 1)
  // tween 2: 跟第一個補間動畫雷同,只是這次是控制文字,並在 0.5 內完成
  .to(".example__title", 0.5, {
    autoAlpha: 1,
    scale: 1,
    ease: Back.easeOut.config(4)