Pen Settings

HTML

CSS

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

JavaScript

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

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.

Behavior

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.

HTML

              
                <!--

== Note: ==
IMO, there are some accessibility concerns with using this method, especially with regard to notifying the user when the hamburger menu is open and closed.

For this reason, JavaScript may be a better option for providing more robust and accessible hamburger / mega menus.

== Better Option: ==
If you are comfortable with JS, I highly recommend my more accessible JavaScript version: https://codepen.io/markcaron/pen/VgGJRW

-->

<header>
  
  <!--
  == Open menu button == 
  - Hidden on medium–large devices
  - Covered when menu is open on small devices
  - When clicked, focuses on #main-menu <nav>
  -->
  <a href="#main-menu"
     id="main-menu-toggle"
     class="menu-toggle"
     aria-label="Open main menu">
    <span class="sr-only">Open main menu</span>
    <span class="fa fa-bars" aria-hidden="true"></span>
  </a>
  
  <h1 class="logo">hamburgers</h1>
  
  <nav id="main-menu" class="main-menu" aria-label="Main menu">
    <!--
    == Close menu button == 
    - Hidden on medium–large devices
    - Not shown when menu is closed on small devices
    - When clicked, focuses on #main-menu <nav>
    - First link in <nav> so DOM order makes sense in toggling open/closed
    -->
    <a href="#main-menu-toggle"
       id="main-menu-close"
       class="menu-close"
       aria-label="Close main menu">
      <span class="sr-only">Close main menu</span>
      <span class="fa fa-close" aria-hidden="true"></span>
    </a>
    <!--
    == Main menu heading ==
    - Added June 23, 2020
    - Adds heading for unordered list of links for better accessibility, using aria-labelledby
    --> 
    <h2 id="main-menu-heading" class="sr-only">Main menu</h2>
    <ul aria-labelledby="main-menu-heading">
      <li><a href="#">Products</a></li>
      <li><a href="#">About</a></li>
      <li><a href="#">Contact</a></li>
    </ul>
  </nav>
  <!--
  == Backdrop ==
  - Hidden when menu is closed AND on medium–large devices
  - Provides "click area" for clicking off the menu to hide
  - Tabindex is -1 so that it can be clicked, but not focused on (for accessibility purposes)
  -->
  <a href="#main-menu-toggle"
     class="backdrop"
     tabindex="-1"
     aria-hidden="true" hidden></a>
</header>

<!--
 == Demo purposes only ==
 - Lots of text = scroll testing!
 - Not necessary for using the menu. Only the stuff above!
-->
<article>
  <h2>Hamburgers are delicious</h2>
  <p>Even better is bacon...ipsum dolor amet kielbasa sirloin pancetta andouille biltong jowl brisket corned beef turducken flank. Andouille corned beef shank tongue leberkas turducken cow pork chop salami bresaola frankfurter shankle. Pork belly porchetta prosciutto, pancetta meatloaf cow frankfurter pork chuck biltong boudin ball tip ham. Corned beef pig beef ribs burgdoggen.</p>

  <p>Flank jerky tri-tip strip steak tail biltong. Tongue chicken burgdoggen, leberkas ham hock landjaeger sausage cupim shankle strip steak ribeye tenderloin jowl. Pork drumstick flank pork loin, tenderloin chuck pastrami kielbasa brisket kevin cow swine strip steak. Picanha shoulder t-bone burgdoggen, alcatra tongue tail ham hock bacon meatloaf rump shankle. Boudin ham leberkas burgdoggen ground round short ribs chicken pancetta meatloaf picanha t-bone. Short loin rump strip steak, short ribs cupim tongue pancetta flank ball tip tail.</p>

  <p>Alcatra jowl biltong kevin, shankle ham hock sausage turducken andouille. Ribeye prosciutto turkey flank, picanha kielbasa ball tip. Shoulder tenderloin bresaola, corned beef boudin capicola burgdoggen t-bone bacon short loin hamburger drumstick. Beef pork belly biltong sausage jerky picanha frankfurter boudin beef ribs cupim capicola salami. Biltong alcatra sirloin, kevin frankfurter short loin doner beef ribs landjaeger sausage venison. Shoulder t-bone ham hock pig.</p>

  <p>Brisket beef spare ribs, pastrami pancetta bresaola pig short loin flank t-bone. Porchetta biltong filet mignon pork loin picanha shank kielbasa boudin sausage alcatra. Ball tip bresaola salami tail meatloaf shoulder short ribs pancetta pork loin venison, picanha tongue pig turkey. Rump filet mignon sausage ribeye biltong. Short ribs pork chop corned beef, venison kevin pork loin tail strip steak ham hock porchetta.</p>

  <p>Cow beef ribs ham hock ball tip bacon pork belly. Shank beef tenderloin landjaeger. Pork loin shank drumstick ball tip, turkey pig ground round kevin t-bone chicken. Ham hock chicken ribeye jowl pork belly bresaola. Sausage leberkas landjaeger ham pork belly bresaola short ribs burgdoggen shank jowl capicola kielbasa swine. Pork belly leberkas boudin tail. Pork chop cow leberkas tenderloin corned beef, shankle ham hock cupim tail chuck jerky rump.</p>
</article>
              
            
!

CSS

              
                /* Better box-model */
*,
*:before,
*:after {
  box-sizing: border-box;
}

/*
  Screen reader only
*/
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/*
  ===================================================
  Base styles for all devices sizes, but mobile first
  ===================================================
*/

/*
  Hamburger menu icon/'button' styling
*/
.menu-toggle {
  display: inline-block;
  padding: .75em 15px;
  line-height: 1em;
  font-size: 1em;
  color: #333;
}

.menu-toggle:hover,
.menu-toggle:focus {
  color: #c00;
}

/*
  Offscreen menu styling
  - Default styles + mobile first
*/
.main-menu {
  position: absolute;
  display: none;
  left: -200px; /* push off the screen to the left for future animation */
  top: 0;
  height: 100%;
	overflow-y: scroll;
	overflow-x: visible;
	transition: left 0.3s ease,
				      box-shadow 0.3s ease;
	z-index: 999;
}

.main-menu ul {
  list-style: none;
  margin: 0;
  padding: 2.5em 0 0;
  /* Hide shadow w/ -8px while 'closed' */
  -webkit-box-shadow: -8px 0 8px rgba(0,0,0,.5);
     -moz-box-shadow: -8px 0 8px rgba(0,0,0,.5);
          box-shadow: -8px 0 8px rgba(0,0,0,.5);
  min-height: 100%;
  width: 200px;
  background: #1a1a1a;
}

/*
  Generic style for ALL hamburger menu links
*/
.main-menu a {
  display: block;
  padding: .75em 15px;
  line-height: 1em;
  font-size: 1em;
  color: #fff;
  text-decoration: none;
  border-bottom: 1px solid #383838;
}

.main-menu a.menu-close {
  border-bottom: 0; /* no border for the X 'button' */
}

.main-menu li:first-child a {
  border-top: 1px solid #383838; /* add top border only for the first link */
}

/*
  Hover & focus style
*/
.main-menu a:hover,
.main-menu a:focus {
  background: #333;
  text-decoration: underline;
}

/*
  Close button positioning
  - Other styles come from `.main-menu a`
*/
.main-menu .menu-close {
  position: absolute;
  right: 0;
  top: 0;
}

/*
  =======================================
  On small devices, allow it to toggle...
  =======================================
*/

/*
  Opening hamburger menu!
  - Using `:target` for non-JavaScript
  - `[aria-expanded]` will be used if/when JavaScript is added to improve interaction, though it's completely optional.
*/
.main-menu:target,
.main-menu[aria-expanded="true"] {
  display: block;
  left: 0; /* slide from -200px to the left edge at 0 */
  outline: none;
  /* fix box-shadow so it shows now */
  -moz-box-shadow: 3px 0 12px rgba(0,0,0,.25);
  -webkit-box-shadow: 3px 0 12px rgba(0,0,0,.25);
  box-shadow: 3px 0 12px rgba(0,0,0,.25);
}

/*
  Close menu button
  - Make sure it's on top!
  - Basically, when `.main-menu` is the target of the click, get its child `.menu-close` link
*/
.main-menu:target .menu-close,
.main-menu[aria-expanded="true"] .menu-close {
  z-index: 1001;
}

/*
  Hamburger menu list
  - Make sure it's on top!
  - Basically, when `.main-menu` is the target of the click, get its child `<ul>`
*/
.main-menu:target ul,
.main-menu[aria-expanded="true"] ul {
  position: relative;
  z-index: 1000;
}

/*
  Backdrop
  - Show backdrop
  - Basically, when `.main-menu` is the target of the click, get its sibling `.backdrop`
  - Note: we could use `.main-menu:target:after`, but
 it wouldn't be clickable.
*/
.main-menu:target + .backdrop,
.main-menu[aria-expanded="true"] + .backdrop{
  position: absolute;
  display: block;  
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  z-index: 998;
  background: #000;
  background: rgba(0,0,0,.85);
  cursor: default;
}

/*
  ======================================================
  If CSS supports `fixed`, like all good modern browsers
  ======================================================
*/
@supports (position: fixed) {
  /*
    Allow backdrop to stay fixed and not "scroll"
  */
  .main-menu,
  .main-menu:target + .backdrop,
  .main-menu[aria-expanded="true"] + .backdrop {
    position: fixed;
  }
}

/*
  ================================
  Larger screen styling
  ================================
*/

/*
  Horizontal menu (i.e. no hamburger)
*/
@media (min-width: 768px) {
  /* Hide hamburger menu/'button' */
  .menu-toggle,
  .main-menu .menu-close {
    display: none;
  }
  
  /* Undo positioning of off-canvas menu */
  .main-menu {
    position: relative;
		left: auto;
		top: auto;
		height: auto;
    display: block;
  }
  
  .main-menu ul {
    display: flex; /* allows for full height of menu */
    
    /* Undo off-canvas styling */
    padding: 0;
    -webkit-box-shadow: none;
       -moz-box-shadow: none;
            box-shadow: none;
    height: auto;
    width: auto;
    background: none;
  }
  
  .main-menu a {
    color: #06c;
    border: 0 !important; /* Remove borders from off-canvas styling */
  }
  
  .main-menu a:hover,
  .main-menu a:focus {
    background: none; /* Remove background from off-canvas styling */
    color: #c00;
  }
}

/*
 Demo purposes only
*/
header {
  padding: 20px;
  display: flex;
  align-items: baseline;
}

article {
  padding: 30px;
  max-width: 55em;
  font-size: 16px;
  line-height: 1.5em;
}

article h2 {
  font-weight: 500;
  font-size: 28px;
}

.logo {
  margin: 0 30px 0 10px;
  font-size: 1.5em;
}
              
            
!

JS

              
                    
              
            
!
999px

Console