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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.

!
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).

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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.

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Packages

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HTML 

              
                <div class="button-group">
  <div>
  <svg viewBox="0 0 512 512"><path d="M427 201.9c-0.6-4.2-2.9-8-6.4-10.3L264.2 87.3c-4.9-3.3-11.4-3.3-16.3 0L91.4 191.6c-4 2.7-6.5 7.4-6.5 12.2v104.3c0 4.8 2.5 9.6 6.5 12.2l156.4 104.3c4.9 3.3 11.4 3.3 16.3 0L420.6 320.4c4-2.6 6.6-7.4 6.6-12.2V203.9C427.1 203.2 427.1 202.6 427 201.9 427 201.7 427.1 202.6 427 201.9zM270.7 127.1l115.2 76.8 -51.5 34.4 -63.8-42.7V127.1zM241.3 127.1v68.6l-63.8 42.7 -51.5-34.4L241.3 127.1zM114.3 231.4l36.8 24.6 -36.8 24.6V231.4zM241.3 384.9L126.1 308.1l51.5-34.4 63.8 42.6V384.9zM256 290.8l-52-34.8 52-34.8 52 34.8L256 290.8zM270.7 384.9V316.3l63.8-42.6 51.5 34.4L270.7 384.9zM397.7 280.6l-36.8-24.6 36.8-24.6V280.6z"/></svg><!--[if lt IE 9]><em>CodePen</em><![endif]-->
  
  </div>
  <div>
    <svg viewBox="0 0 512 512"><path d="M256 70.7c-102.6 0-185.9 83.2-185.9 185.9 0 82.1 53.3 151.8 127.1 176.4 9.3 1.7 12.3-4 12.3-8.9V389.4c-51.7 11.3-62.5-21.9-62.5-21.9 -8.4-21.5-20.6-27.2-20.6-27.2 -16.9-11.5 1.3-11.3 1.3-11.3 18.7 1.3 28.5 19.2 28.5 19.2 16.6 28.4 43.5 20.2 54.1 15.4 1.7-12 6.5-20.2 11.8-24.9 -41.3-4.7-84.7-20.6-84.7-91.9 0-20.3 7.3-36.9 19.2-49.9 -1.9-4.7-8.3-23.6 1.8-49.2 0 0 15.6-5 51.1 19.1 14.8-4.1 30.7-6.2 46.5-6.3 15.8 0.1 31.7 2.1 46.6 6.3 35.5-24 51.1-19.1 51.1-19.1 10.1 25.6 3.8 44.5 1.8 49.2 11.9 13 19.1 29.6 19.1 49.9 0 71.4-43.5 87.1-84.9 91.7 6.7 5.8 12.8 17.1 12.8 34.4 0 24.9 0 44.9 0 51 0 4.9 3 10.7 12.4 8.9 73.8-24.6 127-94.3 127-176.4C441.9 153.9 358.6 70.7 256 70.7z"/></svg><!--[if lt IE 9]><em>GitHub</em><![endif]-->
  </div>
  <div class="active">
    <svg viewBox="0 0 512 512"><path d="M256 68.4C152.4 68.4 68.4 152.4 68.4 256c0 103.6 84 187.6 187.6 187.6S443.6 359.6 443.6 256C443.6 152.4 359.6 68.4 256 68.4zM410.6 247.3c-40.3-6.6-77.3-7-111-1.1 -3.8-8.8-7.8-17.6-12-26.3 36.1-15.6 65.1-36.9 86.7-63.8C395.4 181 408.6 212.6 410.6 247.3zM350.5 133.4c-18.8 24.3-44.8 43.5-78 57.5 -15.9-29.1-34-57.5-54.5-85 12.2-3.1 24.9-4.9 38-4.9C291.6 101 324.3 113.2 350.5 133.4zM186.1 117.9c20.8 27.2 39.3 55.3 55.3 84.1 -38 11.2-83.4 16.9-135.8 17.3C116.4 175 146.3 138.1 186.1 117.9zM101 256c0-1.3 0.2-2.7 0.2-4 60.2-0.1 112.1-7 155.6-20.7 3.6 7.4 7.1 14.9 10.5 22.4 -52.8 16.5-96.4 50.4-130.3 101.3C114.5 328.2 101 293.6 101 256zM160.9 378.1c30.8-48.3 70.1-79.7 118.8-94.2 14.5 37.8 25.2 76.8 31.9 116.6 -17.3 6.7-36 10.5-55.6 10.5C220.1 411 187.2 398.6 160.9 378.1zM342 384.8c-6.9-36.8-16.9-72.8-30-107.8 29.3-4.1 61.6-3.1 96.9 3.1C402.1 323.6 377.2 361.3 342 384.8z"/></svg><!--[if lt IE 9]><em>Dribbble</em><![endif]-->
  </div>
  <div>
    <svg viewBox="0 0 512 512"><path d="M254.8 171.8c6.4 8.9 9.6 19.6 9.6 32 0 12.8-3.2 23.1-9.7 30.9 -3.6 4.4-9 8.4-16 12 10.7 3.9 18.8 10.1 24.2 18.5 5.5 8.4 8.2 18.7 8.2 30.7 0 12.4-3.1 23.6-9.3 33.5 -4 6.6-8.9 12.1-14.9 16.5 -6.7 5.1-14.6 8.6-23.7 10.5 -9.1 1.9-19 2.8-29.6 2.8H99.1V149.5h101.4C226.1 149.8 244.2 157.3 254.8 171.8zM140.9 185.9v46.3h51c9.1 0 16.5-1.7 22.2-5.2 5.7-3.5 8.5-9.6 8.5-18.4 0-9.8-3.8-16.2-11.3-19.4 -6.5-2.2-14.7-3.3-24.8-3.3H140.9zM140.9 266.9v55.9h50.9c9.1 0 16.2-1.2 21.2-3.7 9.2-4.6 13.8-13.3 13.8-26.2 0-10.9-4.5-18.4-13.4-22.5 -5-2.3-12-3.5-21-3.6H140.9L140.9 266.9zM396.4 207.3c10.8 4.8 19.8 12.5 26.8 23 6.4 9.2 10.5 19.9 12.4 32.1 1.1 7.1 1.5 17.4 1.3 30.8H323.9c0.6 15.6 6 26.5 16.2 32.7 6.2 3.9 13.6 5.8 22.4 5.8 9.2 0 16.8-2.4 22.5-7.1 3.2-2.6 5.9-6.1 8.4-10.7h41.4c-1.1 9.2-6.1 18.5-15 28 -13.9 15.1-33.4 22.6-58.4 22.6 -20.6 0-38.9-6.4-54.6-19.1 -15.8-12.7-23.7-33.4-23.7-62.1 0-26.9 7.1-47.5 21.4-61.8 14.2-14.3 32.7-21.5 55.5-21.5C373.4 200 385.6 202.4 396.4 207.3zM335.7 242.3c-5.7 5.9-9.3 13.9-10.8 24h69.9c-0.7-10.8-4.3-18.9-10.8-24.5 -6.5-5.6-14.5-8.4-24.1-8.4C349.5 233.4 341.4 236.4 335.7 242.3zM402.8 161.5h-91.2V182.7h91.2V161.5z"/></svg><!--[if lt IE 9]><em>Behance</em><![endif]-->
  </div>
</div>

<svg class="svg-filters">
  <defs>
  <radialGradient id="active" x1="0%" y1="0%" x2="100%" y2="0%">
      <stop offset="0%" style="stop-color:#ebf7ff;stop-opacity:1" />
      <stop offset="100%" style="stop-color:#b3e1ff;stop-opacity:1" />
    </radialGradient>
  
<filter id="inset-shadow">
      <feOffset
        dx='-1'
        dy='1'
      />
      <feGaussianBlur
        stdDeviation='.7'
        result='offset-blur'
      />
      <feComposite
        operator='out'
        in='SourceGraphic'
        in2='offset-blur'
        result='inverse'
      />
      <feFlood
        flood-color='black'
        flood-opacity='0.05'
        result='color'
      />
      <feComposite
        operator='in'
        in='color'
        in2='inverse'
        result='shadow'
      />
      <feComposite
        operator='over'
        in='shadow'
        in2='SourceGraphic'
      />
    </filter>
  </defs>
</svg>
!

CSS 

              
                body
  padding 0
  margin 0
  display flex
  background #303030 
  align-items center
  justify-content center
  min-height 100vh
  &:after
    content ""
    opacity .7
    width 100%
    min-height 100vh
    background: #303033 url(http://subtlepatterns.com/patterns/broken_noise.png);
    position absolute
    z-index 1  
.button-group
  position relative
  z-index 2
  display flex
  min-width 600px
  height 100px
  background-color #000
  border-radius 7px
  padding 4px
  & > div
    cursor pointer
    flex 1
    background-image: linear-gradient(to top, #242424 0%, #303030 100%);
    display flex
    align-items center
    justify-content center
    margin 1px
    transition .2s
    font-size 2.5em
    box-shadow inset 0 20px 4px -21px rgba(#fff,.4), 0 19px 13px 0 rgba(0,0,0,.3)
    color #181818
    position relative
    z-index 2
    &:before
      content ""
      display block
      width .8em
      height .8em
      transition .1s
      background-image: radial-gradient(circle 30px at center, #ebf7ff 0%, #b3e1ff 47%, #b3e1ff 100%);
      position absolute
      filter blur(15px)
      top 50%
      left 50%
      border-radius 50%
      transform translate(-50%, -50%)
      opacity 0
    &:after
      content ""
      display block
      height 70px
      width 1px
      position absolute
      border-radius 50%
      z-index -1
      opacity 0
      transition .2s
      filter blur(0px)
      box-shadow:
        -75px 0 0px 0px rgba(#b3e1ff, 0.3),
        74px 0 0px 0px rgba(#b3e1ff, 0.35)
    svg   
      height 2em    
      width 2em
      position relative
      display block
      fill #181818
      filter: drop-shadow(0 1px 1px  rgba(#fff, 0.15)) url(#inset-shadow)
     
    &.active
      background-image: linear-gradient(to top, #151515 0%, #1d1d1d 100%);
      box-shadow inset 0 16px 14px -21px transparent, 0 0px 13px 0 rgba(0,0,0,0.3),inset 0 0 7px 2px rgba(0,0,0,0.4)
      z-index 0
      &:before
        width 1em
        height 1em
        opacity .8
      &:after
        opacity 0
      svg
        fill url(#active)
        filter: drop-shadow(0 1px 1px  rgba(#fff, 0))
      
  div:first-of-type
    border-radius 4px 0 0 4px
    &:after
      box-shadow -85px 0 18px 1px transparent, 83px 0 12px 1px #b3e1ff
  div:last-of-type
    border-radius 0 4px 4px 0
    &:after
      box-shadow -85px 0 18px 1px #b3e1ff, 83px 0 12px 1px transparent
    
        
        
.svg-filters
  height 0
  width 0
!

JS 

              
                // Based on this dribbble: https://dribbble.com/shots/694671-Buttons-Free-PSD

$( ".button-group > div" ).click(function() {
  $('.button-group > div.active').not(this).removeClass('active');
  $( this ).toggleClass( "active" );
});
!
999px

Console