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="container">
  <div class="jumbotron">
    <div class="row">
      <div class="col-xs-12">
        <h1 class="text-center">Christian Doppler</h1>
        <h2 class="text-center"><em>Austrian mathematician and physicist</em></h2>
        <div class="thumbnail"><img src="" alt="Christian Doppler">
          <div class="caption text-center">B/W picture anno unknown</div>
        <div class="col-xs-12 col-sm-10 col-sm-offset-1 col-md-10 col-md-offset-2">
          <h3>Here's a time line of Christian Dopplers life:</h3>
            <li><strong>1822</strong> - He enrolled himself in an institute called Salzburg Lyceum. </li>
            <li><strong>1825</strong> - Graduated from Salzburg Lyceum.</li>
            <li><strong>1829</strong> - Was an assistant to Professor Burg.</li>
            <li><strong>1836</strong> - Started to teach for four hours at the Polytechnic institute in Prague.</li>        
            <li><strong>1836</strong> - Married his wife, Mathild Sturm.</li>        
            <li><strong>1838</strong> - Ended teaching four hours at the Polytechnic institute in Prague.</li>      
            <li><strong>1841</strong> - He was made a full-time teacher at the Polytechnic Institute.</li>        
            <li><strong>1842</strong> - Gave a lecture to the Royal Bohemian Society about the doppler effect.</li>
            <li><strong>1848</strong> - Given an honorary doctorate from the University of Prague.</li>
            <li><strong>1983</strong> - Elected into the Royal Bohemian Society.</li>      
            <p>"He has done some cool stuff."</p>
          <h3>For more info just click on  <a href="" target="_blank">here</a>.</h3>
  <footer class="text-center">
    <p>Written and coded by <a href="" target="_blank">1CoolDude</a>.</p>


                body {
  margin-top: 60px;