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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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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-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

Add External Stylesheets/Pens

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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.

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.

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You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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Packages

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.

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About Packages

Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <div id="root"></div>
!

CSS 

              
                html
   background-color: #4472C4  //4472C4 59D7FA
   // background: linear-gradient(to right, #7f00ff, #e100ff)
   // padding: 70px
#root
   font-family: 'Fjalla One', sans-serif
   
#calendar
   background-color: #ed7057
   width: 200px
   height: 300px
   padding: 20px
   margin: 0 auto
   margin-top: 50px
   box-shadow: 8px 8px 0.01px #444444
   border-radius: 3px
   border-top: 25px solid #355999
   color: white
   
#day
   width: 100px
   // background-color: #fff
   padding: 10px 25%
   color: #525151
   text-align: center
   color: white
   
#weekday
   margin: -25px 25% 30px 25%
   color:  white    //#525151
   text-align: center
// #month
//    width: 100px
//    color: #525151
//    // background-color: #000
   
#date
   width: 150px
   height: 120px
   font-size: 80px
   background-color: #F4F6F5
   box-shadow: 2px 2px 5px #444444
   color: #525151
   border-radius: 5px
   margin: 0 auto
   text-align: center
   padding-top: 30px

#time_now
   color: #525151
   border-radius: 5px
   font-size: 20px
   padding: 10px
   margin-top: -30px
   // background-color: #E4E1E1
   // color: #9A9A9B
   text-align: center
   
h1   
   font-size: 50px
   font-weight: 700
   color: white
   text-align: center
!

JS 

              
                function tick(){
        var week = new Array("Sunday","Monday","Tuesday","Wednesday",
                                    "Thursday","Friday","Saturday")
        const element = (
          <div>
             <h1>Cherish EVERY MOMENT!</h1>
             <div id="calendar">
                <h3 id="date">{new Date().getDate()}</h3>
                <h2 id="day">{new Date().getFullYear()} / {new Date().getMonth()+1}</h2>
                <h2 id="weekday">{week[new Date().getDay()]}</h2>
                <h2 id="time_now">{new Date().toLocaleTimeString().split("上午")}</h2>
                </div>
          </div>
        )



          ReactDOM.render(
            element,
            document.getElementById('root')
          );
        }
setInterval(tick, 1000);
!
999px

Console