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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

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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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HTML 

              
                <div class="container" onclick="this.classList.toggle('active')">
  <span class="text">LOGIN</span>
  <svg class="fingerprint fingerprint-base" xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100">
    <g class="fingerprint-out" fill="none" stroke-width="2" stroke-linecap="round">
      <path
            class="odd" d="m 25.117139,57.142857 c 0,0 -1.968558,-7.660465 -0.643619,-13.149003 1.324939,-5.488538 4.659682,-8.994751 4.659682,-8.994751" />
      <path
            class="odd" d="m 31.925369,31.477584 c 0,0 2.153609,-2.934998 9.074971,-5.105078 6.921362,-2.17008 11.799844,-0.618718 11.799844,-0.618718" />
      <path
            class="odd" d="m 57.131213,26.814448 c 0,0 5.127709,1.731228 9.899495,7.513009 4.771786,5.781781 4.772971,12.109204 4.772971,12.109204" />
      <path
            class="odd" d="m 72.334009,50.76769 0.09597,2.298098 -0.09597,2.386485" />
      <path
            class="even" d="m 27.849282,62.75 c 0,0 1.286086,-1.279223 1.25,-4.25 -0.03609,-2.970777 -1.606117,-7.675266 -0.625,-12.75 0.981117,-5.074734 4.5,-9.5 4.5,-9.5" />
      <path
            class="even" d="m 36.224282,33.625 c 0,0 8.821171,-7.174484 19.3125,-2.8125 10.491329,4.361984 11.870558,14.952665 11.870558,14.952665" />
      <path
            class="even" d="m 68.349282,49.75 c 0,0 0.500124,3.82939 0.5625,5.8125 0.06238,1.98311 -0.1875,5.9375 -0.1875,5.9375" />
      <path
            class="odd" d="m 31.099282,65.625 c 0,0 1.764703,-4.224042 2,-7.375 0.235297,-3.150958 -1.943873,-9.276886 0.426777,-15.441942 2.370649,-6.165056 8.073223,-7.933058 8.073223,-7.933058" />
      <path
            class="odd" d="m 45.849282,33.625 c 0,0 12.805566,-1.968622 17,9.9375 4.194434,11.906122 1.125,24.0625 1.125,24.0625" />
      <path
            class="even" d="m 59.099282,70.25 c 0,0 0.870577,-2.956221 1.1875,-4.5625 0.316923,-1.606279 0.5625,-5.0625 0.5625,-5.0625" />
      <path
            class="even" d="m 60.901059,56.286612 c 0,0 0.903689,-9.415996 -3.801777,-14.849112 -3.03125,-3.5 -7.329245,-4.723939 -11.867187,-3.8125 -5.523438,1.109375 -7.570313,5.75 -7.570313,5.75" />
      <path
            class="even" d="m 34.072577,68.846248 c 0,0 2.274231,-4.165782 2.839205,-9.033748 0.443558,-3.821814 -0.49394,-5.649939 -0.714206,-8.05386 -0.220265,-2.403922 0.21421,-4.63364 0.21421,-4.63364" />
      <path
            class="odd" d="m 37.774165,70.831845 c 0,0 2.692139,-6.147592 3.223034,-11.251208 0.530895,-5.103616 -2.18372,-7.95562 -0.153491,-13.647655 2.030229,-5.692035 8.108442,-4.538898 8.108442,-4.538898" />
      <path
            class="odd" d="m 54.391174,71.715729 c 0,0 2.359472,-5.427681 2.519068,-16.175068 0.159595,-10.747388 -4.375223,-12.993087 -4.375223,-12.993087" />
      <path
            class="even" d="m 49.474282,73.625 c 0,0 3.730297,-8.451831 3.577665,-16.493718 -0.152632,-8.041887 -0.364805,-11.869326 -4.765165,-11.756282 -4.400364,0.113044 -3.875,4.875 -3.875,4.875" />
      <path
            class="even" d="m 41.132922,72.334447 c 0,0 2.49775,-5.267079 3.181981,-8.883029 0.68423,-3.61595 0.353553,-9.413359 0.353553,-9.413359" />
      <path
            class="odd" d="m 45.161782,73.75 c 0,0 1.534894,-3.679847 2.40625,-6.53125 0.871356,-2.851403 1.28125,-7.15625 1.28125,-7.15625" />
      <path
            class="odd" d="m 48.801947,56.125 c 0,0 0.234502,-1.809418 0.109835,-3.375 -0.124667,-1.565582 -0.5625,-3.1875 -0.5625,-3.1875" />
    </g>
  </svg>
  <svg class="fingerprint fingerprint-active" xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100">
    <g class="fingerprint-out" fill="none" stroke-width="2" stroke-linecap="round">
      <path
            class="odd" d="m 25.117139,57.142857 c 0,0 -1.968558,-7.660465 -0.643619,-13.149003 1.324939,-5.488538 4.659682,-8.994751 4.659682,-8.994751" />
      <path
            class="odd" d="m 31.925369,31.477584 c 0,0 2.153609,-2.934998 9.074971,-5.105078 6.921362,-2.17008 11.799844,-0.618718 11.799844,-0.618718" />
      <path
            class="odd" d="m 57.131213,26.814448 c 0,0 5.127709,1.731228 9.899495,7.513009 4.771786,5.781781 4.772971,12.109204 4.772971,12.109204" />
      <path
            class="odd" d="m 72.334009,50.76769 0.09597,2.298098 -0.09597,2.386485" />
      <path
            class="even" d="m 27.849282,62.75 c 0,0 1.286086,-1.279223 1.25,-4.25 -0.03609,-2.970777 -1.606117,-7.675266 -0.625,-12.75 0.981117,-5.074734 4.5,-9.5 4.5,-9.5" />
      <path
            class="even" d="m 36.224282,33.625 c 0,0 8.821171,-7.174484 19.3125,-2.8125 10.491329,4.361984 11.870558,14.952665 11.870558,14.952665" />
      <path
            class="even" d="m 68.349282,49.75 c 0,0 0.500124,3.82939 0.5625,5.8125 0.06238,1.98311 -0.1875,5.9375 -0.1875,5.9375" />
      <path
            class="odd" d="m 31.099282,65.625 c 0,0 1.764703,-4.224042 2,-7.375 0.235297,-3.150958 -1.943873,-9.276886 0.426777,-15.441942 2.370649,-6.165056 8.073223,-7.933058 8.073223,-7.933058" />
      <path
            class="odd" d="m 45.849282,33.625 c 0,0 12.805566,-1.968622 17,9.9375 4.194434,11.906122 1.125,24.0625 1.125,24.0625" />
      <path
            class="even" d="m 59.099282,70.25 c 0,0 0.870577,-2.956221 1.1875,-4.5625 0.316923,-1.606279 0.5625,-5.0625 0.5625,-5.0625" />
      <path
            class="even" d="m 60.901059,56.286612 c 0,0 0.903689,-9.415996 -3.801777,-14.849112 -3.03125,-3.5 -7.329245,-4.723939 -11.867187,-3.8125 -5.523438,1.109375 -7.570313,5.75 -7.570313,5.75" />
      <path
            class="even" d="m 34.072577,68.846248 c 0,0 2.274231,-4.165782 2.839205,-9.033748 0.443558,-3.821814 -0.49394,-5.649939 -0.714206,-8.05386 -0.220265,-2.403922 0.21421,-4.63364 0.21421,-4.63364" />
      <path
            class="odd" d="m 37.774165,70.831845 c 0,0 2.692139,-6.147592 3.223034,-11.251208 0.530895,-5.103616 -2.18372,-7.95562 -0.153491,-13.647655 2.030229,-5.692035 8.108442,-4.538898 8.108442,-4.538898" />
      <path
            class="odd" d="m 54.391174,71.715729 c 0,0 2.359472,-5.427681 2.519068,-16.175068 0.159595,-10.747388 -4.375223,-12.993087 -4.375223,-12.993087" />
      <path
            class="even" d="m 49.474282,73.625 c 0,0 3.730297,-8.451831 3.577665,-16.493718 -0.152632,-8.041887 -0.364805,-11.869326 -4.765165,-11.756282 -4.400364,0.113044 -3.875,4.875 -3.875,4.875" />
      <path
            class="even" d="m 41.132922,72.334447 c 0,0 2.49775,-5.267079 3.181981,-8.883029 0.68423,-3.61595 0.353553,-9.413359 0.353553,-9.413359" />
      <path
            class="odd" d="m 45.161782,73.75 c 0,0 1.534894,-3.679847 2.40625,-6.53125 0.871356,-2.851403 1.28125,-7.15625 1.28125,-7.15625" />
      <path
            class="odd" d="m 48.801947,56.125 c 0,0 0.234502,-1.809418 0.109835,-3.375 -0.124667,-1.565582 -0.5625,-3.1875 -0.5625,-3.1875" />
    </g>
  </svg>
  <svg class="ok" xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><path d="M34.912 50.75l10.89 10.125L67 36.75" fill="none" stroke="#fff" stroke-width="6"/></svg>
</div>
!

CSS 

              
                body {
  align-items: center;
  display: flex;
  font-family: sans-serif;
  font-weight: 600;
  font-size: 26px;
  height: 100vh;
  justify-content: center;
  margin: 0;
}
.container {
  align-items: center;
  background: #000;
  border-radius: 40px;
  box-shadow: 0 14px 28px rgba(0,0,0,0.25), 0 10px 10px rgba(0,0,0,0.22);
  display: flex;
  height: 80px;
  justify-content: center;
  position: relative;
  width: 200px;
}
.text {
  color: white;
  position: absolute;
  transition: opacity 300ms;
  user-select: none;
  -moz-user-select: none;
}
.fingerprint {
  /* height: 80px; */
  left: -8px;
  opacity: 0;
  position: absolute;
  stroke: #777;
  top: -9px;
  transition: opacity 1ms;
}
.fingerprint-active {
  stroke: #fff;
}
.fingerprint-out {
  opacity: 1;
}
.odd {
  stroke-dasharray: 0px 50px;
  stroke-dashoffset: 1px;
  transition: stroke-dasharray 1ms;
}
.even {
  stroke-dasharray: 50px 50px;
  stroke-dashoffset: -41px;
  transition: stroke-dashoffset 1ms;
}
.ok {
  opacity: 0;
}
.active.container {
  animation: 6s Container;
}
.active .text {
  opacity: 0;
  animation: 6s Text forwards;
}
.active .fingerprint {
  opacity: 1;
  transition: opacity 300ms 200ms;
}
.active .fingerprint-base .odd {
  stroke-dasharray: 50px 50px;
  transition: stroke-dasharray 800ms 100ms;
}
.active .fingerprint-base .even {
  stroke-dashoffset: 0px;
  transition: stroke-dashoffset 800ms;
}
.active .fingerprint-active .odd {
  stroke-dasharray: 50px 50px;
  transition: stroke-dasharray 2000ms 1500ms;
}
.active .fingerprint-active .even {
  stroke-dashoffset: 0px;
  transition: stroke-dashoffset 2000ms 1300ms;
}
.active .fingerprint-out {
  opacity: 0;
  transition: opacity 300ms 4100ms;
}
.active .ok {
  opacity: 1;
  animation: 6s Ok forwards;
}
@keyframes Container {
  0% { width: 200px }
  6% { width: 80px }
  71% { transform: scale(1); }
  75% { transform: scale(1.2); }
  77% { transform: scale(1); }

  94% { width: 80px }
  100% { width: 200px }
}
@keyframes Text {
  0% { opacity: 1; transform: scale(1); }
  6% { opacity: 0; transform: scale(0.5); }

  94% { opacity: 0; transform: scale(0.5); }
  100% { opacity: 1; transform: scale(1); }
}
@keyframes Ok {
  0% { opacity: 0 }
  70% { opacity: 0; transform: scale(0); }
  75% { opacity: 1; transform: scale(1.1); }
  77% { opacity: 1; transform: scale(1); }
  92% { opacity: 1; transform: scale(1); }
  96% { opacity: 0; transform: scale(0.5); }
  100% { opacity: 0 }
}
!

JS 

              
                const container = document.querySelector('.container')
container.addEventListener('animationend', () => {
  container.classList.remove('active');
});
!
999px

Console