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HTML

About HTML Preprocessors

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

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

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

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

CSS

About CSS Preprocessors

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

Learn more · Versions

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

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.

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About External Resources

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

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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

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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

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HTML 

              
                <header>
  <div class="container">
    <h1>Bootstrap</h1>
    <h3>Accordion</h3>
  </div>
</header>

<nav class="navbar navbar-default no-margin no-border no-radius">
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar-i">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#home">Home</a>
    </div>
    <div class="collapse navbar-collapse" id="navbar-i">
      <ul class="nav navbar-nav navbar-right">
        <li><a href="#one">One</a></li>
        <li><a href="#two">Two</a></li>
        <li><a href="#three">Three</a></li>
      </ul>
    </div>
  </div>
</nav>

<main id="home" class="contents">
  <section id="one" class="i-row i-row-odd ir-white">
    <div class="container">
      <h2 class="section-title">Accordion One</h2>
      <div class="row">
        <div class="col-md-6">
          <!-- Defaults -->
          <h3>Default <i class="fa fa-thumbs-o-down"></i> <small>CSS</small></h3>
          <div class="panel-group d-accordion">
            <div class="panel panel-default">
              <div class="panel-heading" data-toggle="collapse" data-parent=".d-accordion" href="#aboutus">
                <h4 class="panel-title">About Us <i class="fa fa-chevron-up pull-right"></i></h4>
              </div>
              <div id="aboutus" class="panel-collapse collapse in">
                <div class="panel-body">
                  <p>Nec tristique! Odio sit turpis ac sit magna, non. Elementum ultrices tristique, rhoncus lectus, turpis ac, purus magna! Et massa pulvinar ridiculus dsignissim. Egestas</p>
                </div>
              </div>
            </div>
            <div class="panel panel-default">
              <div class="panel-heading" data-toggle="collapse" data-parent=".d-accordion" href="#whoweare">
                <h4 class="panel-title">Who We Are <i class="fa fa-chevron-up pull-right"></i></h4>
              </div>
              <div id="whoweare" class="panel-collapse collapse">
                <div class="panel-body">
                  <p>Nec tristique! Odio sit turpis ac sit magna, non. Elementum ultrices tristique, rhoncus lectus, turpis ac, purus magna! Et massa pulvinar ridiculus dignissim. Egestas</p>
                </div>
              </div>
            </div>
            <div class="panel panel-default">
              <div class="panel-heading" data-toggle="collapse" data-parent=".d-accordion" href="#contactus">
                <h4 class="panel-title">Contact Us <i class="fa fa-chevron-up pull-right"></i></h4>
              </div>
              <div id="contactus" class="panel-collapse collapse">
                <div class="panel-body">
                  <p>Nec tristique! Odio sit turpis ac sit magna, non. Elementum ultrices tristique, rhoncus lectus, turpis ac, purus magna! Et massa pulvinar ridiculus dignissim. Egestas</p>
                </div>
              </div>
            </div>
          </div>
        </div>
        <div class="col-md-6">
          <!-- Fixed -->
          <h3>Fixed <i class="fa fa-thumbs-o-up"></i> <small>jQuery</small></h3>
          <div class="panel-group i-accordion">
            <div class="panel panel-success">
              <div class="panel-heading" data-toggle="collapse" data-parent=".i-accordion" href="#aboutus2">
                <h4 class="panel-title">About Us <i class="fa fa-chevron-up pull-right"></i></h4>
              </div>
              <div id="aboutus2" class="panel-collapse collapse in">
                <div class="panel-body">
                  <p>Nec tristique! Odio sit turpis ac sit magna, non. Elementum ultrices tristique, rhoncus lectus, turpis ac, purus magna! Et massa pulvinar ridiculus dignissim. Egestas</p>
                </div>
              </div>
            </div>
            <div class="panel panel-success">
              <div class="panel-heading" data-toggle="collapse" data-parent=".i-accordion" href="#whoweare2">
                <h4 class="panel-title">Who We Are <i class="fa fa-chevron-down pull-right"></i></h4>
              </div>
              <div id="whoweare2" class="panel-collapse collapse">
                <div class="panel-body">
                  <p>Nec tristique! Odio sit turpis ac sit magna, non. Elementum ultrices tristique, rhoncus lectus, turpis ac, purus magna! Et massa pulvinar ridiculus dignissim. Egestas</p>
                </div>
              </div>
            </div>
            <div class="panel panel-success">
              <div class="panel-heading" data-toggle="collapse" data-parent=".i-accordion" href="#contactus2">
                <h4 class="panel-title">Contact Us <i class="fa fa-chevron-down pull-right"></i></h4>
              </div>
              <div id="contactus2" class="panel-collapse collapse">
                <div class="panel-body">
                  <p>Nec tristique! Odio sit turpis ac sit magna, non. Elementum ultrices tristique, rhoncus lectus, turpis ac, purus magna! Et massa pulvinar ridiculus dignissim. Egestas</p>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </section>
  <section id="two" class="i-row i-row-even">
    <div class="container">
      <h2 class="section-title">Accordion Two</h2>
      <div class="row">
        <div class="col-md-6">
          <!-- Fixed -->
          <h3>Fixed <i class="fa fa-thumbs-o-up"></i> <small>jQuery</small></h3>
          <div class="panel-group accordion-2a">
            <div class="panel panel-info">
              <div class="panel-heading" data-toggle="collapse" data-parent=".accordion-2a" href="#a2-a01">
                <h4 class="panel-title">About Us <i class="fa fa-minus pull-right"></i></h4>
              </div>
              <div id="a2-a01" class="panel-collapse collapse in">
                <div class="panel-body">
                  <p>Nec tristique! Odio sit turpis ac sit magna, non. Elementum ultrices tristique, rhoncus lectus, turpis ac, purus magna! Et massa pulvinar ridiculus dignissim. Egestas</p>
                  <p>Ricotta danish fontina mozzarella. Boursin stinking bishop roquefort rubber cheese cheese and wine cheese on toast parmesan croque monsieur. Cut the cheese swiss babybel danish fontina stilton halloumi edam queso. Fromage frais squirty cheese cheese slices dolcelatte fromage when the cheese comes out everybody's happy airedale boursin. Cheese and wine when the cheese comes out everybody's happy halloumi.</p>
                  <p>Boursin who moved my cheese emmental. Swiss bavarian bergkase cheesy feet roquefort stilton jarlsberg cheesy feet cottage cheese. Mascarpone cauliflower cheese feta hard cheese smelly cheese ricotta taleggio boursin. Jarlsberg cut the cheese.</p>
                </div>
              </div>
            </div>
            <div class="panel panel-info">
              <div class="panel-heading" data-toggle="collapse" data-parent=".accordion-2a" href="#a2-a02">
                <h4 class="panel-title">Who We Are <i class="fa fa-plus pull-right"></i></h4>
              </div>
              <div id="a2-a02" class="panel-collapse collapse">
                <div class="panel-body">
                  <p>Jarlsberg croque monsieur say cheese. Stilton cheddar cheese and biscuits pecorino cream cheese cheese triangles rubber cheese jarlsberg. Macaroni cheese cheese strings cheese slices parmesan bavarian bergkase chalk and cheese fondue parmesan. Parmesan macaroni cheese rubber cheese who moved my cheese hard cheese who moved my cheese the big cheese.</p>
                  <p>Cheeseburger rubber cheese macaroni cheese. Stinking bishop say cheese stilton melted cheese cheeseburger cheeseburger blue castello caerphilly. Roquefort cheese strings ricotta cheese strings when the cheese comes out everybody's happy mascarpone queso cheese triangles. Say cheese dolcelatte stinking bishop bocconcini st. agur blue cheese pepper jack.</p>
                </div>
              </div>
            </div>
            <div class="panel panel-info">
              <div class="panel-heading" data-toggle="collapse" data-parent=".accordion-2a" href="#a2-a03">
                <h4 class="panel-title">Contact Us <i class="fa fa-plus pull-right"></i></h4>
              </div>
              <div id="a2-a03" class="panel-collapse collapse">
                <div class="panel-body">
                  <p>Roquefort fondue queso. Cheeseburger cheese and biscuits cheesecake cheese strings cheddar say cheese mascarpone halloumi. Macaroni cheese feta fromage frais cheese and biscuits cheesecake cauliflower cheese emmental pecorino. Jarlsberg cut the cheese brie who moved my cheese when the cheese comes out everybody's happy monterey jack squirty cheese.</p>
                  <p>The big cheese danish fontina edam. Rubber cheese cauliflower cheese halloumi everyone loves mozzarella cheese slices macaroni cheese cheesecake. Bavarian bergkase squirty cheese cream cheese cow fondue boursin boursin cut the cheese. Cow.</p>
                </div>
              </div>
            </div>
          </div>
        </div>
        <div class="col-md-6">
          <!-- Fixed -->
          <h3>Fixed <i class="fa fa-thumbs-o-up"></i> <small>jQuery</small></h3>
          <div class="panel-group accordion-2b">
            <div class="panel panel-danger">
              <div class="panel-heading" data-toggle="collapse" data-parent=".accordion-2b" href="#a2-b01">
                <h4 class="panel-title">About Us <i class="fa fa-minus pull-right"></i></h4>
              </div>
              <div id="a2-b01" class="panel-collapse collapse in">
                <div class="panel-body">
                  <p>Nec tristique! Odio sit turpis ac sit magna, non. Elementum ultrices tristique, rhoncus lectus, turpis ac, purus magna! Et massa pulvinar ridiculus dignissim. Egestas</p>
                  <p>Ricotta danish fontina mozzarella. Boursin stinking bishop roquefort rubber cheese cheese and wine cheese on toast parmesan croque monsieur. Cut the cheese swiss babybel danish fontina stilton halloumi edam queso. Fromage frais squirty cheese cheese slices dolcelatte fromage when the cheese comes out everybody's happy airedale boursin. Cheese and wine when the cheese comes out everybody's happy halloumi.</p>
                  <p>Boursin who moved my cheese emmental. Swiss bavarian bergkase cheesy feet roquefort stilton jarlsberg cheesy feet cottage cheese. Mascarpone cauliflower cheese feta hard cheese smelly cheese ricotta taleggio boursin. Jarlsberg cut the cheese.</p>
                </div>
              </div>
            </div>
            <div class="panel panel-danger">
              <div class="panel-heading" data-toggle="collapse" data-parent=".accordion-2b" href="#a2-b02">
                <h4 class="panel-title">Who We Are <i class="fa fa-plus pull-right"></i></h4>
              </div>
              <div id="a2-b02" class="panel-collapse collapse">
                <div class="panel-body">
                  <p>Jarlsberg croque monsieur say cheese. Stilton cheddar cheese and biscuits pecorino cream cheese cheese triangles rubber cheese jarlsberg. Macaroni cheese cheese strings cheese slices parmesan bavarian bergkase chalk and cheese fondue parmesan. Parmesan macaroni cheese rubber cheese who moved my cheese hard cheese who moved my cheese the big cheese.</p>
                  <p>Cheeseburger rubber cheese macaroni cheese. Stinking bishop say cheese stilton melted cheese cheeseburger cheeseburger blue castello caerphilly. Roquefort cheese strings ricotta cheese strings when the cheese comes out everybody's happy mascarpone queso cheese triangles. Say cheese dolcelatte stinking bishop bocconcini st. agur blue cheese pepper jack.</p>
                </div>
              </div>
            </div>
            <div class="panel panel-danger">
              <div class="panel-heading" data-toggle="collapse" data-parent=".accordion-2b" href="#a2-b03">
                <h4 class="panel-title">Contact Us <i class="fa fa-plus pull-right"></i></h4>
              </div>
              <div id="a2-b03" class="panel-collapse collapse">
                <div class="panel-body">
                  <p>Roquefort fondue queso. Cheeseburger cheese and biscuits cheesecake cheese strings cheddar say cheese mascarpone halloumi. Macaroni cheese feta fromage frais cheese and biscuits cheesecake cauliflower cheese emmental pecorino. Jarlsberg cut the cheese brie who moved my cheese when the cheese comes out everybody's happy monterey jack squirty cheese.</p>
                  <p>The big cheese danish fontina edam. Rubber cheese cauliflower cheese halloumi everyone loves mozzarella cheese slices macaroni cheese cheesecake. Bavarian bergkase squirty cheese cream cheese cow fondue boursin boursin cut the cheese. Cow.</p>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </section>
  <section id="three" class="i-row i-row-odd">
    <div class="container">
      <h2 class="section-title">Accordion Three</h2>
      <div class="row">
        <div class="col-md-12">
          <!-- Fixed -->
          <h3>Fixed <i class="fa fa-thumbs-o-up"></i> <small>jQuery</small></h3>
          <div class="panel-group accordion-3">
            <div class="panel panel-info">
              <div class="panel-heading" data-toggle="collapse" data-parent=".accordion-3" href="#a3-a01">
                <h4 class="panel-title">About Us <i class="fa fa-minus pull-right"></i></h4>
              </div>
              <div id="a3-a01" class="panel-collapse collapse in">
                <div class="panel-body">
                  <p>Nec tristique! Odio sit turpis ac sit magna, non. Elementum ultrices tristique, rhoncus lectus, turpis ac, purus magna! Et massa pulvinar ridiculus dignissim. Egestas</p>
                  <p>Ricotta danish fontina mozzarella. Boursin stinking bishop roquefort rubber cheese cheese and wine cheese on toast parmesan croque monsieur. Cut the cheese swiss babybel danish fontina stilton halloumi edam queso. Fromage frais squirty cheese cheese slices dolcelatte fromage when the cheese comes out everybody's happy airedale boursin. Cheese and wine when the cheese comes out everybody's happy halloumi.</p>
                  <p>Boursin who moved my cheese emmental. Swiss bavarian bergkase cheesy feet roquefort stilton jarlsberg cheesy feet cottage cheese. Mascarpone cauliflower cheese feta hard cheese smelly cheese ricotta taleggio boursin. Jarlsberg cut the cheese.</p>
                </div>
              </div>
            </div>
            <div class="panel panel-info">
              <div class="panel-heading" data-toggle="collapse" data-parent=".accordion-3" href="#a3-a02">
                <h4 class="panel-title">Who We Are <i class="fa fa-plus pull-right"></i></h4>
              </div>
              <div id="a3-a02" class="panel-collapse collapse">
                <div class="panel-body">
                  <p>Jarlsberg croque monsieur say cheese. Stilton cheddar cheese and biscuits pecorino cream cheese cheese triangles rubber cheese jarlsberg. Macaroni cheese cheese strings cheese slices parmesan bavarian bergkase chalk and cheese fondue parmesan. Parmesan macaroni cheese rubber cheese who moved my cheese hard cheese who moved my cheese the big cheese.</p>
                  <p>Cheeseburger rubber cheese macaroni cheese. Stinking bishop say cheese stilton melted cheese cheeseburger cheeseburger blue castello caerphilly. Roquefort cheese strings ricotta cheese strings when the cheese comes out everybody's happy mascarpone queso cheese triangles. Say cheese dolcelatte stinking bishop bocconcini st. agur blue cheese pepper jack.</p>
                </div>
              </div>
            </div>
            <div class="panel panel-info">
              <div class="panel-heading" data-toggle="collapse" data-parent=".accordion-3" href="#a3-a03">
                <h4 class="panel-title">Contact Us <i class="fa fa-plus pull-right"></i></h4>
              </div>
              <div id="a3-a03" class="panel-collapse collapse">
                <div class="panel-body">
                  <p>Roquefort fondue queso. Cheeseburger cheese and biscuits cheesecake cheese strings cheddar say cheese mascarpone halloumi. Macaroni cheese feta fromage frais cheese and biscuits cheesecake cauliflower cheese emmental pecorino. Jarlsberg cut the cheese brie who moved my cheese when the cheese comes out everybody's happy monterey jack squirty cheese.</p>
                  <p>The big cheese danish fontina edam. Rubber cheese cauliflower cheese halloumi everyone loves mozzarella cheese slices macaroni cheese cheesecake. Bavarian bergkase squirty cheese cream cheese cow fondue boursin boursin cut the cheese. Cow.</p>
                </div>
              </div>
            </div>
            <div class="panel panel-danger">
              <div class="panel-heading" data-toggle="collapse" data-parent=".accordion-3" href="#a3-a04">
                <h4 class="panel-title">About Us <i class="fa fa-plus pull-right"></i></h4>
              </div>
              <div id="a3-a04" class="panel-collapse collapse">
                <div class="panel-body">
                  <p>Nec tristique! Odio sit turpis ac sit magna, non. Elementum ultrices tristique, rhoncus lectus, turpis ac, purus magna! Et massa pulvinar ridiculus dignissim. Egestas</p>
                  <p>Ricotta danish fontina mozzarella. Boursin stinking bishop roquefort rubber cheese cheese and wine cheese on toast parmesan croque monsieur. Cut the cheese swiss babybel danish fontina stilton halloumi edam queso. Fromage frais squirty cheese cheese slices dolcelatte fromage when the cheese comes out everybody's happy airedale boursin. Cheese and wine when the cheese comes out everybody's happy halloumi.</p>
                  <p>Boursin who moved my cheese emmental. Swiss bavarian bergkase cheesy feet roquefort stilton jarlsberg cheesy feet cottage cheese. Mascarpone cauliflower cheese feta hard cheese smelly cheese ricotta taleggio boursin. Jarlsberg cut the cheese.</p>
                </div>
              </div>
            </div>
            <div class="panel panel-danger">
              <div class="panel-heading" data-toggle="collapse" data-parent=".accordion-3" href="#a3-a05">
                <h4 class="panel-title">Who We Are <i class="fa fa-plus pull-right"></i></h4>
              </div>
              <div id="a3-a05" class="panel-collapse collapse">
                <div class="panel-body">
                  <p>Jarlsberg croque monsieur say cheese. Stilton cheddar cheese and biscuits pecorino cream cheese cheese triangles rubber cheese jarlsberg. Macaroni cheese cheese strings cheese slices parmesan bavarian bergkase chalk and cheese fondue parmesan. Parmesan macaroni cheese rubber cheese who moved my cheese hard cheese who moved my cheese the big cheese.</p>
                  <p>Cheeseburger rubber cheese macaroni cheese. Stinking bishop say cheese stilton melted cheese cheeseburger cheeseburger blue castello caerphilly. Roquefort cheese strings ricotta cheese strings when the cheese comes out everybody's happy mascarpone queso cheese triangles. Say cheese dolcelatte stinking bishop bocconcini st. agur blue cheese pepper jack.</p>
                </div>
              </div>
            </div>
            <div class="panel panel-danger">
              <div class="panel-heading" data-toggle="collapse" data-parent=".accordion-3" href="#a3-a06">
                <h4 class="panel-title">Contact Us <i class="fa fa-plus pull-right"></i></h4>
              </div>
              <div id="a3-a06" class="panel-collapse collapse">
                <div class="panel-body">
                  <p>Roquefort fondue queso. Cheeseburger cheese and biscuits cheesecake cheese strings cheddar say cheese mascarpone halloumi. Macaroni cheese feta fromage frais cheese and biscuits cheesecake cauliflower cheese emmental pecorino. Jarlsberg cut the cheese brie who moved my cheese when the cheese comes out everybody's happy monterey jack squirty cheese.</p>
                  <p>The big cheese danish fontina edam. Rubber cheese cauliflower cheese halloumi everyone loves mozzarella cheese slices macaroni cheese cheesecake. Bavarian bergkase squirty cheese cream cheese cow fondue boursin boursin cut the cheese. Cow.</p>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </section>
</main>

<footer>
  <div class="container">
    <p class="text-muted no-margin">Powered by Ivan 2015</p>
  </div>
</footer>
!

CSS 

              
                html { min-height: 100%; position: relative; }
body { margin-bottom: 60px; }
.btn, .btn:hover, .btn:focus, .btn:active, .btn:active:focus { outline: 0; }
.btn-custom { margin-bottom: 1em; }
.no-margin { margin: 0; }
.no-padding { padding: 0; }
.no-border { border: 0; }
.no-radius { border-radius: 0; }

/*** Header ***/
header { padding: 30px 0; background-color: #6f5499; color: #fff; }
  header h1 { margin: 0; }
  header h3 { margin: 0; color: rgba(255,255,255,.4); }

/*** Nav ***/
.navbar-default { background-color: #f5f5f5; box-shadow: 0 1px 0 0 rgba(0,0,0,0.1); }
  .navbar-default .nav>li>a:focus, 
  .navbar-default .nav>li>a:hover { background-color: #e5e5e5; }

/*** Content ***/
main {}
  .i-row { padding-top: 40px; padding-bottom: 40px; }
  .i-row-odd { background-color: #ffffff; }
  .i-row-even { background-color: #f7f7f7; }

.section-title { margin-top: 0; margin-bottom: 0.6em; font-weight: 500; }
.section-title .fa { margin-right: 5px; color: #6f5499; }

/*** Footer ***/
footer { padding: 20px 0; background-color: #333; position: absolute; bottom: 0; width: 100%; height: 60px; }

/******************************************/

.i-accordion .panel-heading,
.d-accordion .panel-heading,
.accordion-2a .panel-heading,
.accordion-2b .panel-heading,
.accordion-3 .panel-heading { cursor: pointer; }
.d-accordion .panel-heading.collapsed .fa-chevron-up:before { content: '\f078'; }
!

JS 

              
                $(function () {
  // Smooth Scroll
  $('a[href*=#]').bind('click', function(e){
    var anchor = $(this);
    $('html, body').stop().animate({
      scrollTop: $(anchor.attr('href')).offset().top
    }, 1000);
    e.preventDefault();
  });
});

$('.i-accordion').on('show.bs.collapse', function(n){
  $(n.target).siblings('.panel-heading').find('.panel-title i').toggleClass('fa-chevron-down fa-chevron-up');
});
$('.i-accordion').on('hide.bs.collapse', function(n){
  $(n.target).siblings('.panel-heading').find('.panel-title i').toggleClass('fa-chevron-up fa-chevron-down');
});

/* P */
$('.accordion-2a, .accordion-2b, .accordion-3').on('show.bs.collapse', function(n){
  $(n.target).siblings('.panel-heading').find('.panel-title i').toggleClass('fa-minus fa-plus');
});
$('.accordion-2a, .accordion-2b, .accordion-3').on('hide.bs.collapse', function(n){
  $(n.target).siblings('.panel-heading').find('.panel-title i').toggleClass('fa-plus fa-minus');
});
!
999px

Console