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HTML

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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-.

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                body
  main
    .input(data-text='Try me!')
    .keyboard
      .key.l.label.lt
        span esc
      .key.func
        svg(width='20px' height='20px' viewBox='0 0 20 20')
          path(d='M11.8,10c0,1-0.8,1.8-1.8,1.8S8.2,11,8.2,10S9,8.2,10,8.2S11.8,9,11.8,10z M10,13.8v0.7 M10,5.5v0.7 M13.8,10 h0.7 M5.5,10h0.7 M12.7,12.7l0.5,0.5 M6.8,6.8l0.5,0.5 M13.2,6.8l-0.5,0.5 M6.8,13.2l0.5-0.5')
        span f1
      .key.func
        svg(width='20px' height='20px' viewBox='0 0 20 20')
          path(d='M12.4,10c0,1.3-1.1,2.4-2.4,2.4S7.6,11.3,7.6,10S8.7,7.6,10,7.6S12.4,8.7,12.4,10z M10,14.4V16 M10,4v1.6 M14.4,10H16 M4,10h1.6 M13.1,13.1l1.1,1.1 M5.7,5.7l1.1,1.1 M13.1,6.9l1.1-1.1 M5.7,14.3l1.1-1.1')
        span f2
      .key.func
        svg(width='20px' height='20px' viewBox='0 0 20 20')
          path(d='M8.5,8.8H2c-0.3,0-0.5-0.2-0.5-0.5v-3c0-0.3,0.2-0.5,0.5-0.5h6.5C8.7,4.8,9,5.1,9,5.3v3C9,8.6,8.7,8.8,8.5,8.8 z M11.4,14.7v-3c0-0.3-0.2-0.5-0.5-0.5H5.4c-0.3,0-0.5,0.2-0.5,0.5v3c0,0.3,0.2,0.5,0.5,0.5h5.4C11.1,15.2,11.4,14.9,11.4,14.7z M18.5,12.4V6.4c0-0.3-0.2-0.5-0.5-0.5h-3.5c-0.3,0-0.5,0.2-0.5,0.5v5.9c0,0.3,0.2,0.5,0.5,0.5H18C18.3,12.9,18.5,12.6,18.5,12.4z')
        span f3
      .key.func
        svg(width='20px' height='20px' viewBox='0 0 20 20')
          path(d='M5,15.1H2c-0.3,0-0.5-0.2-0.5-0.5v-3c0-0.3,0.2-0.5,0.5-0.5h3c0.3,0,0.5,0.2,0.5,0.5v3 		C5.5,14.9,5.3,15.1,5,15.1z M12,14.6v-3c0-0.3-0.2-0.5-0.5-0.5h-3c-0.3,0-0.5,0.2-0.5,0.5v3c0,0.3,0.2,0.5,0.5,0.5h3 C11.8,15.1,12,14.9,12,14.6z M18.5,14.6v-3c0-0.3-0.2-0.5-0.5-0.5h-3c-0.3,0-0.5,0.2-0.5,0.5v3c0,0.3,0.2,0.5,0.5,0.5h3 C18.3,15.1,18.5,14.9,18.5,14.6z M5.5,8.4v-3c0-0.3-0.2-0.5-0.5-0.5H2c-0.3,0-0.5,0.2-0.5,0.5v3c0,0.3,0.2,0.5,0.5,0.5h3 C5.3,8.9,5.5,8.7,5.5,8.4z M12,8.4v-3c0-0.3-0.2-0.5-0.5-0.5h-3C8.2,4.9,8,5.1,8,5.4v3c0,0.3,0.2,0.5,0.5,0.5h3 C11.8,8.9,12,8.7,12,8.4z M18.5,8.4v-3c0-0.3-0.2-0.5-0.5-0.5h-3c-0.3,0-0.5,0.2-0.5,0.5v3c0,0.3,0.2,0.5,0.5,0.5h3 C18.3,8.9,18.5,8.7,18.5,8.4z')
        span f4
      .key.func
        span f5
      .key.func
        span f6
      .key.func
        svg(width='20px' height='20px' viewBox='0 0 20 20')
          path(d='M9.7,6.5v6.9l-6-3.5L9.7,6.5z M9.7,10l6,3.5V6.5L9.7,10z')
        span f7
      .key.func
        svg(width='20px' height='20px' viewBox='0 0 20 20')
          path(d='M10.4,10l-6,3.5V6.5L10.4,10z M12.6,6.5v6.9 M15.6,6.5v6.9')
        span f8
      .key.func
        svg(width='20px' height='20px' viewBox='0 0 20 20')
          path(d='M16.3,10l-6,3.5V6.5L16.3,10z M4.3,6.5v6.9l6-3.5L4.3,6.5z')
        span f9
      .key.func
        svg(width='20px' height='20px' viewBox='0 0 20 20')
          path(d='M13,14.2l-3.3-2.5H7.5c-0.3,0-0.5-0.2-0.5-0.5V8.9c0-0.3,0.2-0.5,0.5-0.5h2.2L13,5.8V14.2z')
        span f10
      .key.func
        svg(width='20px' height='20px' viewBox='0 0 20 20')
          path(d='M11.5,14.2l-3.3-2.5H6.1c-0.3,0-0.5-0.2-0.5-0.5V8.9c0-0.3,0.2-0.5,0.5-0.5h2.2l3.3-2.5V14.2z M13.6,13 c0.5-0.9,0.8-1.9,0.8-3c0-1.1-0.3-2.1-0.8-3')
        span f11
      .key.func
        svg(width='20px' height='20px' viewBox='0 0 20 20')
          path(d='M9,14.2l-3.3-2.5H3.6c-0.3,0-0.5-0.2-0.5-0.5V8.9c0-0.3,0.2-0.5,0.5-0.5h2.2L9,5.8V14.2z M11.1,13 c0.5-0.9,0.8-1.9,0.8-3c0-1.1-0.3-2.1-0.8-3 M13.2,14.5c0.8-1.3,1.3-2.8,1.3-4.5c0-1.7-0.5-3.2-1.3-4.5 M15.1,16 c1.1-1.7,1.8-3.8,1.8-6c0-2.2-0.7-4.3-1.8-6')
        span f12
      .key.icon
        svg(width='20px' height='20px' viewBox='0 0 20 20')
          path(d='M14.6,9.9H5.4L10,5.8L14.6,9.9z M14.6,14v-1.7c0-0.1-0.1-0.3-0.3-0.3H5.6c-0.1,0-0.3,0.1-0.3,0.3V14 c0,0.1,0.1,0.3,0.3,0.3h8.7C14.5,14.2,14.6,14.1,14.6,14z')

      .key.double
        span.up ~
        span.dw `
      .key.double
        span.up !
        span.dw 1
      .key.double
        span.up @
        span.dw 2
      .key.double
        span.up #
        span.dw 3
      .key.double
        span.up $
        span.dw 4
      .key.double
        span.up %
        span.dw 5
      .key.double
        span.up ^
        span.dw 6
      .key.double
        span.up &
        span.dw 7
      .key.double
        span.up *
        span.dw 8
      .key.double
        span.up (
        span.dw 9
      .key.double
        span.up )
        span.dw 0
      .key.double
        span.up —
        span.dw -
      .key.double
        span.up +
        span.dw =
      .key.l.label.rt.del
        span delete

      .key.l.label.lt
        span tab
      .key.lttr
        span q
      .key.lttr
        span w
      .key.lttr
        span e
      .key.lttr
        span r
      .key.lttr
        span t
      .key.lttr
        span y
      .key.lttr
        span u
      .key.lttr
        span i
      .key.lttr
        span o
      .key.lttr
        span p
      .key.double
        span.up {
        span.dw [
      .key.double
        span.up }
        span.dw ]
      .key.double
        span.up |
        span.dw \

      .key.xl.label.lt.lock
        span caps lock
      .key.lttr
        span a
      .key.lttr
        span s
      .key.lttr
        span d
      .key.lttr.tch
        span f
      .key.lttr
        span g
      .key.lttr
        span h
      .key.lttr.tch
        span j
      .key.lttr
        span k
      .key.lttr
        span l
      .key.double
        span.up :
        span.dw ;
      .key.double
        span.up "
        span.dw '
      .key.xl.label.rt
        span return

      .key.xxl.label.lt
        span shift
      .key.lttr
        span z
      .key.lttr
        span x
      .key.lttr
        span c
      .key.lttr
        span v
      .key.lttr
        span b
      .key.lttr
        span n
      .key.lttr
        span m
      .key.double
        span.up <
        span.dw ,
      .key.double
        span.up >
        span.dw .
      .key.double
        span.up ?
        span.dw /
      .key.xxl.label.rt
        span shift

      .key.label.lt
        span fn
      .key.label.rt
        svg(width='20px' height='20px' viewBox='0 0 20 20')
          polyline(points='14.6,9.7 10,4.6 5.4,9.7')
        span control
      .key.label.rt
        svg(width='20px' height='20px' viewBox='0 0 20 20')
          path(d='M17,9.7H9.7L6.9,4.5H3 M10.6,4.5H17')
        span option
      .key.m.label.rt
        svg(width='20px' height='20px' viewBox='0 0 20 20')
          path(d='M8,8H6.2c-1,0-1.8-0.8-1.8-1.8v0c0-1,0.8-1.8,1.8-1.8h0c1,0,1.8,0.8,1.8,1.8V8z M12,8H8v4h4V8z M6.2,12 c-1,0-1.8,0.8-1.8,1.8v0c0,1,0.8,1.8,1.8,1.8h0c1,0,1.8-0.8,1.8-1.8V12H6.2z M12,13.8c0,1,0.8,1.8,1.8,1.8h0c1,0,1.8-0.8,1.8-1.8v0 c0-1-0.8-1.8-1.8-1.8H12V13.8z M13.8,8c1,0,1.8-0.8,1.8-1.8v0c0-1-0.8-1.8-1.8-1.8h0c-1,0-1.8,0.8-1.8,1.8V8H13.8z')
        span command
      .key.space &nbsp;
      .key.m.label.lt
        svg(width='20px' height='20px' viewBox='0 0 20 20')
          path(d='M8,8H6.2c-1,0-1.8-0.8-1.8-1.8v0c0-1,0.8-1.8,1.8-1.8h0c1,0,1.8,0.8,1.8,1.8V8z M12,8H8v4h4V8z M6.2,12 c-1,0-1.8,0.8-1.8,1.8v0c0,1,0.8,1.8,1.8,1.8h0c1,0,1.8-0.8,1.8-1.8V12H6.2z M12,13.8c0,1,0.8,1.8,1.8,1.8h0c1,0,1.8-0.8,1.8-1.8v0 c0-1-0.8-1.8-1.8-1.8H12V13.8z M13.8,8c1,0,1.8-0.8,1.8-1.8v0c0-1-0.8-1.8-1.8-1.8h0c-1,0-1.8,0.8-1.8,1.8V8H13.8z')
        span command
      .key.label.lt
        svg(width='20px' height='20px' viewBox='0 0 20 20')
          path(d='M17,9.7H9.7L6.9,4.5H3 M10.6,4.5H17')
        span option
      .key.arrow.icon.left
          svg(width='20px' height='20px' viewBox='0 0 20 20')
            path(d='M6.8,10.2l6.2,2.9c0.1,0.1,0.3,0,0.3-0.2V7.1c0-0.1-0.2-0.2-0.3-0.2L6.8,9.8C6.7,9.9,6.7,10.1,6.8,10.2z')
      .key.arrow.split
        .btn.top
          svg(width='20px' height='20px' viewBox='0 0 20 20')
            path(d='M9.8,6.9l-2.9,6.2c-0.1,0.1,0,0.3,0.2,0.3h5.8c0.1,0,0.2-0.2,0.2-0.3l-2.9-6.2C10.1,6.8,9.9,6.8,9.8,6.9z')
        .btn.bottom
          svg(width='20px' height='20px' viewBox='0 0 20 20')
            path(d='M10.2,13.2L13.1,7c0.1-0.1,0-0.3-0.2-0.3H7.1C7,6.7,6.9,6.8,6.9,7l2.9,6.2C9.9,13.3,10.1,13.3,10.2,13.2z')
      .key.arrow.icon.right
          svg(width='20px' height='20px' viewBox='0 0 20 20')
            path(d='M13.2,9.8L7,6.9C6.8,6.9,6.7,7,6.7,7.1v5.8c0,0.1,0.2,0.2,0.3,0.2l6.2-2.9C13.3,10.1,13.3,9.9,13.2,9.8z')
!

CSS 

              
                $main: linear-gradient(135deg, rgba(205,207,214,1) 0%,rgba(190,192,196,1) 100%);

$keyBkg: #f5f5f5;
$keyBkgHover: #e5e3e4;
$keyBkgActive: #c5c3c4;
$keycolor: #757374;
$light: #7d7b7c;
$green: #74f583;
$black: #000;
$white: #fff;

*{box-sizing: border-box; outline: 0px;}
::-moz-selection {background: transparent;}
::selection {background: transparent;}

body{font-family: "Work Sans"; margin: 0px;}
  


main{
  display: block;
  position: absolute;
  top: 50%;
  left: 50%;
  width: auto;
  height: auto;
  transform: translate(-50%, -50%);
  .input{
    display: block;
    position: relative;
    width: 90%;
    height: auto;
    padding: 18px;
    margin: 0px auto 40px auto;
    text-align: center;
    font-family: "Anonymous Pro";
    font-size: 30px;
    line-height: 40px;
    color: $keycolor;
    border: 0px;
    border-bottom: 2px solid #ddd;
    background: transparent;

    &:empty:not(:focus):before{
      content:attr(data-text);
      opacity: .5;
    }
    &:empty:not(:focus):after{
      content:"";
      opacity: 0;
    }
     &:after{
      content:"|";
      opacity: 0;
    }
  }
}


.keyboard{
  display: grid;
  grid-template-columns: repeat(58, 8px);
  grid-template-rows: repeat(6, 56px);
  position:relative;
  width: auto;
  height: auto;
  padding: 10px;
  grid-gap: 8px;
  border-radius: 14px;
  background: $main;
  .key{
    display:block;
    position: relative;
    grid-column: span 4;
    color: $keycolor;
    border-radius: 6px;
    background: $keyBkg;
    border: 1px solid rgba($black,.4);
    box-shadow: 1px 1px 0px 0px rgba($white,.2);
    cursor: pointer;
    &:hover{
      background: $keyBkgHover;
    }
    &:active{
      background: $keyBkgActive;
    }
    &.m{grid-column: span 5;}
    &.l{grid-column: span 6;}
    &.xl{grid-column: span 7;}
    &.xxl{grid-column: span 9;}
    &.space{grid-column: span 20;}
    &.tch:after{
      content:"";
      display: block;
      position: absolute;
      bottom: 10px;
      left: calc(50% - 7px);
      width: 14px;
      height: 3px;
      border-radius: 3px;
      background: transparent;
      box-shadow: 0px 1px 2px rgba($black,.3);
    }
    polyline, path, line{
      fill:none;
      stroke: $light;
      stroke-linecap:round;
      stroke-linejoin:round;
      stroke-miterlimit: 10;
    }
    span{
      display: block;
      position: absolute;
      text-transform: uppercase;
    }
    svg{
      display: block;
      position: absolute;
    }
    &.lttr span{
      width: 100%;
      height: 100%;
      text-align: center;
      font-size: 19px;
      line-height: 54px;
    }
    &.double span{
      width: 100%;
      text-align: center;
      &.up{
        top: 8px;
        font-size: 14px;
        line-height: 12px;
      }
      &.dw{
        bottom: 10px;
        font-size: 19px;
        line-height: 16px;
      }
    }
    &.func span{
      width: 100%;
      bottom: 8px;
      text-align: center;
      font-size: 8px;
      line-height: 8px;
    }
    &.func svg{
      width: 100%;
      top: 8px;
    }
    &.icon svg{
      width: 100%;
      top: 18px;
    }
    &.label{
      color: $light;
      &.lt span{left: 8px;}
      &.rt span{right: 8px;}
      &.lt svg{left: 4px;}
      &.rt svg{right: 4px;}
      span{
        bottom: 8px;
        font-size: 11px;
        font-weight: 400;
        text-transform: none;
      }
      svg{
        top: 4px;
      }
    }
    &.arrow{
      path{
        fill: $light;
        stroke: none;
      }
    }
    &.split{
      .btn{
        display: block;
        position: absolute;
        width: 100%;
        height: 50%;
        svg{
          top: 3px;
          width: 100%;
          path{
            fill: $light;
            stroke: none;
          }
        }
        &.top{
          top: 0px;
          border-bottom:  1px solid rgba($black,.3);
          background: linear-gradient(to bottom, rgba($black,0) 60%,rgba($black,.15) 100%);
        }
        &.bottom{
          bottom: 0px;
          border-top:  1px solid rgba($black,.3);
          background: linear-gradient(to bottom, rgba($black,.15) 0%,rgba($black,0) 40%);
        }
      }
    }
    &.lock:after{
      content:"";
      display: block;
      position: absolute;
      top: 8px;
      left: 8px;
      z-index: 10;
      width: 5px;
      height: 5px;
      border: 1px solid rgba($black,.2);
      border-radius: 16px;
      background: $light;
      opacity: 0.6;
    }
    &.lock.on:after{
      background: $green;
      box-shadow: 0px 0px 4px $green;
    }
  }
}

.key{
  transition: .2s ease-out all; 
  -moz-transition: .2s ease-out all; 
  -webkit-transition: .2s ease-out all;
}

.input:after {
  animation-name: cursor;
  animation-duration: 450ms;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  animation-delay: 2s;
}

@keyframes cursor {
  0%   {opacity: 0}
  100% {opacity: .5}
}
!

JS 

              
                $(".lock").click(function(){
  $(this).toggleClass("on");
});

$(".key").click(function(){
  var $text = $(".input").text();


  
  
  if ($(this).hasClass("lttr") || $(this).hasClass("space")) {
   
    if (!$(".lock").hasClass("on")) {
      $(".input").text($text+$(this).text()); 
    } else {
      $(".input").text($text+$(this).text().toUpperCase()); 
    }
    
  } else if ($(this).hasClass("double")) {
    
    $(".input").text($text+$(this).find(".dw").text()); 
    
  } else if ($(this).hasClass("del")) {
    $(".input").text($text.substr(0, $text.length-1));
  }
  
  if ($text.length > 0) {
    $(".input").addClass("fill");
    console.log($text.length);

  } else {
    $(".input").removeClass("fill");
    console.log($text.length +"ded");
  } 
});
!
999px

Console