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HTML

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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.

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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-.

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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 

              
                html
  head
    link(href='https://fonts.googleapis.com/css?family=Ubuntu:300,400,500',rel='stylesheet',type='text/css')
    link(rel='stylesheet',href='//maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css')
  body
    p Want to give you a clue ? It's a "demo"...
    .main
      .links
        #signin-form
          .backdrop
            a(href='#')
          form
            .rainbow
            .input
              .icon
                i#username-icon.fa.fa-user
                i#username-alert.fa.fa-exclamation-circle
              input(type='text',placeholder='Username',name='username',onclick="removeClass(this.parentNode,'error')")
              .tooltip Oops!
            .input
              .icon
                i#password-icon.fa.fa-key
                i#password-alert.fa.fa-exclamation-circle
              input(type='password',placeholder='Password',name='password',onclick="removeClass(this.parentNode,'error')")
              .icon.purple
                button(onclick="submitForm('#signin-form > form',this)")
                  i#signin-icon.fa.fa-sign-in
                  i#refresh-icon.fa.fa-refresh
              .tooltip That is wrong!
        a.link-signin(href='#signin-form') Sign In
        a.link-forgot(href='#') forgot?
!

CSS 

              
                @import "compass/css3";

$bg: #292931;
$form-bg: #423142;
$pink-touch: #DE3370;
$link-color: #6B5A6B;
$grey: #DEDEDE;
$purple-touch: #AE6AA8;
$rainbow: gradient(linear,  left top,  right top, 
        color-stop(0%, rgb(255, 128, 128)), 
        color-stop(15%, rgb(255, 255, 128)),
        color-stop(30%, rgb(128, 255, 128)),
        color-stop(50%, rgb(128, 255, 255)),
        color-stop(65%, rgb(128, 128, 255)),
        color-stop(80%, rgb(255, 128, 255)),
        color-stop(100%, rgb(255, 128, 128)));

.rainbow {
    background-image: $rainbow;
    background-image: -webkit-+$rainbow;
    background-image: -moz-+$rainbow;
    background-image: -o-+$rainbow;
    background-size: 200%;
    background-repeat: repeat-x;
    border-top-left-radius: .25em;
    -webkit-border-top-left-radius: .25em;
    -moz-border-top-left-radius: .25em;
    border-top-right-radius: .25em;
    -webkit-border-top-right-radius: .25em;
    -moz-border-top-right-radius: .25em;
    width: 100%;
    top: 0; left: 0;
    height: 0.25em;
    position: absolute;
    transition: opacity .1s ease-in;
    opacity: 0;
    &.active {
      opacity: 1;
      animation: rainbowAnimation 1s linear infinite;
      -webkit-animation: rainbowAnimation 1s linear infinite;
      -moz-animation: rainbowAnimation 1s linear infinite;
      -o-animation: rainbowAnimation 1s linear infinite;
    }
}

@keyframes rainbowAnimation {
    0% { background-position: 200% 0% }
    100% { background-position: 0% 0% }
}

@-webkit-keyframes rainbowAnimation {
    0% { background-position: 200% 0% }
    100% { background-position: 0% 0% }
}

@-moz-keyframes rainbowAnimation {
    0% { background-position: 200% 0% }
    100% { background-position: 0% 0% }
}

@-o-keyframes rainbowAnimation {
    0% { background-position: 200% 0% }
    100% { background-position: 0% 0% }
}

@keyframes iconSpin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@-webkit-keyframes iconSpin {
  0% { -webkit-transform: rotate(0deg); }
  100% { -webkit-transform: rotate(360deg); }
}

@-moz-keyframes iconSpin {
  0% { -moz-transform: rotate(0deg); }
  100% { -moz-transform: rotate(360deg); }
}

@-ms-keyframes iconSpin {
  0% { -ms-transform: rotate(0deg); }
  100% { -ms-transform: rotate(360deg); }
}

@-o-keyframes iconSpin {
  0% { -o-transform: rotate(0deg); }
  100% { -o-transform: rotate(360deg); }
}

html, body {
  background: $bg;
  height: 100%;
  font-size: 1.1em;
  margin: 0;
  padding: 0;
  font-family: 'Ubuntu';
}

p {
  position:fixed;
  bottom:1em;
  width:100%;
  text-align:center;
  color: $link-color;
}

.main {
  width: 100%;
  height: 100%;
  justify-content: center;
  -webkit-justify-content: center;
  -moz-justify-content: center;
  display: flex;
  display: -webkit-flex;
  display: -moz-flex;
  display: -ms-flex;
  flex-direction: row;
  -webkit-flex-direction: row;
  -moz-flex-direction: row;
  -ms-flex-direction: row;
  align-items: center;
  -webkit-align-items: center;
}

.links {
  position: relative;
  color: $link-color;
  .link-signin {
    font-size: 1.2em;
    text-transform: uppercase;
    text-decoration: none;
  }
  .link-forgot {
    font-size: .8em;
  }
  a {
    vertical-align: middle;
    padding: 1em 2.8em;
    color: inherit;
  }
}

#signin-form {
  
  &:target {
    & > .backdrop {
      display: block;
    }
    
    & > form {
      transform: scale(1);
      -webkit-transform: scale(1);
      -moz-transform: scale(1);
      -ms-transform: scale(1);
      -o-transform: scale(1);
      opacity: 1;
    }
    
  }
  
  & > .backdrop {
    display: none;
    position: fixed;
    z-index:9;
    top:-99em; left: -99em; right: -99em; bottom: -99em;
    background: transparent;
    
    & > a {
      display: block;
      height: 100%; width: 100%;
    }
   
  }
 
  & > form {
    
    &:after {
      content: '';
      position:absolute;
      width:0;height:0;
      top:calc(100% - 1px);
      border: 16px solid;
      border-color: $form-bg transparent transparent transparent;
    }
    
    border-radius: .25em;
    -webkit-border-radius: .25em;
    -moz-border-radius: .25em;
    z-index:10;
    opacity: 0;
    position: absolute;
    width: 15em;
    top: -8.2em;
    left: 2em;
    background: $form-bg;
    padding: 1em;
    transform: scale(0);
    -webkit-transform: scale(0);
    -moz-transform: scale(0);
    -ms-transform: scale(0);
    -o-transform: scale(0);
    transform-origin: 15% 115%;
    -webkit-transform-origin: 15% 115%;
    -moz-transform-origin: 15% 115%;
    -ms-transform-origin: 15% 115%;
    -o-transform-origin: 15% 115%;
    transition: all .1s ease-in;
    -webkit-transition: all .1s ease-in;
    -moz-transition: all .1s ease-in;
    -o-transition: all .1s ease-in;
  }
    
}

.input {
  
  & > *:first-child {
    border-top-left-radius: .25em;
    -webkit-border-top-left-radius: .25em;
    -moz-border-top-left-radius: .25em;
    border-bottom-left-radius: .25em;
    -webkit-border-bottom-left-radius: .25em;
    -moz-border-bottom-left-radius: .25em;
  }
  
  & > *:nth-last-child(2) {
    border-top-right-radius: .25em;
    -webkit-border-top-right-radius: .25em;
    -moz-border-top-right-radius: .25em;
    border-bottom-right-radius: .25em;
    -webkit-border-bottom-right-radius: .25em;
    -moz-border-bottom-right-radius: .25em;
  }
  
  .tooltip {
    border-radius: .25em;
    -webkit-border-radius: .25em;
    -moz-border-radius: .25em;
    display: block;
    opacity:0;
    transform: scale(0);
    -webkit-transform: scale(0);
    -moz-transform: scale(0);
    -ms-transform: scale(0);
    -o-transform: scale(0);
    transform-origin: -5% 50%;
    -webkit-transform-origin: -5% 50%;
    -moz-transform-origin: -5% 50%;
    -ms-transform-origin: -5% 50%;
    -o-transform-origin: -5% 50%;
    transition: all .1s linear;
    -webkit-transition: all .1s linear;
    -moz-transition: all .1s linear;
    -o-transition: all .1s linear;
    background: $pink-touch;
    color: #fff;
    position: absolute;
    padding: .65em;
    margin-left: .5em;
    font-size: .8em;
    &:before {
      content: ' ';
      position: absolute;
      width:0; height:0;
      top:.9em;left:-15px;
      border:8px solid;
      border-color: transparent $pink-touch transparent transparent;
    }
  }
  
  &.error {
    .tooltip {
      transform: scale(1);
      -webkit-transform: scale(1);
      -moz-transform: scale(1);
      -ms-transform: scale(1);
      -o-transform: scale(1);
      opacity: 1;
    }
    .icon {
      color: #fff;
      background: $pink-touch;
      i:first-child {
        display:none;
      }
      i:nth-child(2) {
        display:block;
      }
      button {
        i:first-child {
          display:block;
        }
        i:nth-child(2) {
          display:none;
        }
      }
    }
  }
  display: flex;
  display: -webkit-flex;
  display: -moz-flex;
  display: -ms-flex;
  flex-direction: row;
  -webkit-flex-direction: row;
  -moz-flex-direction: row;
  -ms-flex-direction: row;
  width: 100%;
  padding: .25em 0;
  .icon {
    display: flex;
    display: -webkit-flex;
    display: -moz-flex;
    display: -ms-flex;
    align-items: center;
    -webkit-align-items: center;
    justify-content: center;
    -webkit-justify-content: center;
    -moz-justify-content: center;
    height: 2em; width: 2em;
    background: $grey;
    transition: all .1s linear;
    -webkit-transition: all .1s linear;
    -moz-transition: all .1s linear;
    -o-transition: all .1s linear;
    -ms-transition: all .1s linear;
    color: #847384;
    &.purple {
      background: $purple-touch;
      color: #fff;
    }
    i {
      font-size: .8em;
    }
    i:first-child {
       display: block;
    }
    i:nth-child(2) {
      display:none;
    }
    
    button {
      width: 100%; height: 100%;
      padding: 0;
      border: none;
      font-size:inherit;
      color: inherit;
      background: transparent;
      i:first-child {
        display: block;
      }
      i:nth-child(2) {
        display: none;
      }
      &:hover {
        cursor:pointer;
        background: rgba(255,255,255,.1);
      }
      &:focus {
        outline: none;
      }
      &.active {
        i:first-child {
          display: none;
        }
        i:nth-child(2) {
          display: block;
        }
      }
    }
    
  }
}

input {
  flex:1;
  -moz-flex:1;
  -ms-flex:1;
  -webkit-flex:1;
  padding-left: .9em;
  font-size: .7em;
  border: none;
  border-radius: 0;
  -webkit-border-radius: 0;
  -moz-border-radius: 0;
  &:focus {
    outline:none;
  }
}

#refresh-icon {
  animation: iconSpin 1s linear infinite;
  -webkit-animation: iconSpin 1s linear infinite;
  -moz-animation: iconSpin 1s linear infinite;
  -ms-animation: iconSpin 1s linear infinite;
  -o-animation: iconSpin 1s linear infinite;
}
 
* {
  box-sizing: border-box;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
}
!

JS 

              
                /* Basic addClass and removeClass function like in jQuery, but I didn't use it here */
function addClass (el,className) {
  if (!el.getAttribute('class') || el.getAttribute('class').indexOf(className) < 0) {
    el.setAttribute('class',el.getAttribute('class') + ' ' + className);
  }
}

function removeClass (el,className) {
  if (el.getAttribute('class') && el.getAttribute('class').indexOf(className) > 0) {
    el.setAttribute('class',el.getAttribute('class').replace(' '+className, ''));
  }
}

/* The function launched to submit the form */
function submitForm (form,btn) {
  event.preventDefault();
  
  var rainbow = document.querySelector(form+' .rainbow');
  var inputs = document.querySelectorAll(form+' input');
  addClass(rainbow, 'active');
  addClass(btn, 'active');
 
  /* This is a timeout to fake the waiting of a server response */
  setTimeout(function(){
    for (var i=0; i<inputs.length; i++) {
      if(!inputs[i].value || inputs[i].value !== 'demo') {
        addClass(inputs[i].parentNode,'error');
      }
    }
    removeClass(rainbow, 'active');
    removeClass(btn, 'active');
  }, 1500);
  
}

/* Because it's better to see the signin panel at start, I faked a click here... */
setTimeout(function () { document.querySelector('a.link-signin').click(); }, 500);
!
999px

Console