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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>

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Insecure Resource

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CSS

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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

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 

              
                <main>
	<div class="container">
		<h1>Fancy Search Box</h1>
		<h2>Try below!</h2>
		<div class="search-box">
			<div class="search-icon"><i class="fa fa-search search-icon"></i></div>
			<form action="" class="search-form">
				<input type="text" placeholder="Search" id="search" autocomplete="off">
			</form>
			<svg class="search-border" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/" x="0px" y="0px" viewBox="0 0 671 111" style="enable-background:new 0 0 671 111;"
			 xml:space="preserve">
          <path class="border" d="M335.5,108.5h-280c-29.3,0-53-23.7-53-53v0c0-29.3,23.7-53,53-53h280"/>
          <path class="border" d="M335.5,108.5h280c29.3,0,53-23.7,53-53v0c0-29.3-23.7-53-53-53h-280"/>
        </svg>
			<div class="go-icon"><i class="fa fa-arrow-right"></i></div>
		</div>

	</div>
</main>
!

CSS 

              
                html, body {
  font-family: 'Montserrat Alternates', sans-serif;
  color: #FFFFFF;
  width: 100%;
  max-width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
}
*, *:before, *:after {
  -webkit-tap-highlight-color: transparent;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
  user-select: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -o-user-select: none;
  box-sizing: border-box;
  -webkit-box-sizing: border-box;
  padding: 0;
  margin: 0;
}
a, a:visited, a:hover {
  color: inherit;
  text-decoration: none;
}
main {
  position: absolute;
  top: 0;
  left: 0;
  margin: 0 auto;
  padding: 0 26px;
  width: 100%;
  height: 100%;
  background: rgba(154,57,163,1);
  background: -moz-linear-gradient(-45deg, rgba(154,57,163,1) 0%, rgba(65,103,168,1) 100%);
  background: -webkit-gradient(left top, right bottom, color-stop(0%, rgba(154,57,163,1)), color-stop(100%, rgba(65,103,168,1)));
  background: -webkit-linear-gradient(-45deg, rgba(154,57,163,1) 0%, rgba(65,103,168,1) 100%);
  background: -o-linear-gradient(-45deg, rgba(154,57,163,1) 0%, rgba(65,103,168,1) 100%);
  background: -ms-linear-gradient(-45deg, rgba(154,57,163,1) 0%, rgba(65,103,168,1) 100%);
  background: linear-gradient(135deg, rgba(154,57,163,1) 0%, rgba(65,103,168,1) 100%);
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#9a39a3', endColorstr='#4167a8', GradientType=1 );
}
h1 {
  display: block;
  margin: 0 auto 25px auto;
  text-align: center;
  font-size: 1.92em;
  font-weight: 600;
  letter-spacing: -0.055em;
}
h2 {
  display: block;
  margin: 0 auto 60px auto;
  text-align: center;
  font-weight: 400;
  font-size: 1.25em;
  letter-spacing: -0.015em;
}
.container {
  position: relative;
  margin: calc(75px + 2vh + 2vw) auto 0 auto;
  padding: 0;
  width: 100%;
  max-width: 840px;
}
.search-box {
  position: relative;
  width: 100%;
  max-width: 360px;
  height: 60px;
  border-radius: 120px;
  margin: 0 auto;
}
.search-icon, .go-icon {
  position: absolute;
  top: 0;
  height: 60px;
  width: 86px;
  line-height: 61px;
  text-align: center;
}
.search-icon {
  left: 0;
  pointer-events: none;
  font-size: 1.22em;
  will-change: transform;
  transform: rotate(-45deg);
  -webkit-transform: rotate(-45deg);
  -moz-transform: rotate(-45deg);
  -o-transform: rotate(-45deg);
  transform-origin: center center;
  -webkit-transform-origin: center center;
  -moz-transform-origin: center center;
  -o-transform-origin: center center;
  transition: transform 400ms 220ms cubic-bezier(0.190, 1.000, 0.220, 1.000);
  -webkit-transition: transform 400ms 220ms cubic-bezier(0.190, 1.000, 0.220, 1.000);
  -moz-transition: transform 400ms 220ms cubic-bezier(0.190, 1.000, 0.220, 1.000);
  -o-transition: transform 400ms 220ms cubic-bezier(0.190, 1.000, 0.220, 1.000);
}
.si-rotate {
  transform: rotate(0deg);
  -webkit-transform: rotate(0deg);
  -moz-transform: rotate(0deg);
  -o-transform: rotate(0deg);
}
.go-icon {
  right: 0;
  pointer-events: none;
  font-size: 1.38em;
  will-change: opacity;
  cursor: default;
  opacity: 0;
  transform: rotate(45deg);
  -webkit-transform: rotate(45deg);
  -moz-transform: rotate(45deg);
  -o-transform: rotate(45deg);
  transition: opacity 190ms ease-out, transform 260ms cubic-bezier(0.190, 1.000, 0.220, 1.000);
  -webkit-transition: opacity 190ms ease-out, transform 260ms cubic-bezier(0.190, 1.000, 0.220, 1.000);
  -moz-transition: opacity 190ms ease-out, transform 260ms cubic-bezier(0.190, 1.000, 0.220, 1.000);
  -o-transition: opacity 190ms ease-out, transform 260ms cubic-bezier(0.190, 1.000, 0.220, 1.000);
}
.go-in {
  opacity: 1;
  pointer-events: all;
  cursor: pointer;
  transform: rotate(0);
  -webkit-transform: rotate(0);
  -moz-transform: rotate(0);
  -o-transform: rotate(0);
  transition: opacity 190ms ease-out, transform 260ms 20ms cubic-bezier(0.190, 1.000, 0.220, 1.000);
  -webkit-transition: opacity 190ms ease-out, transform 260ms 20ms cubic-bezier(0.190, 1.000, 0.220, 1.000);
  -moz-transition: opacity 190ms ease-out, transform 260ms 20ms cubic-bezier(0.190, 1.000, 0.220, 1.000);
  -o-transition: opacity 190ms ease-out, transform 260ms 20ms cubic-bezier(0.190, 1.000, 0.220, 1.000);
}
.search-border {
  display: block;
  width: 100%;
  max-width: 360px;
  height: 60px;
}
.border {
  fill: none;
  stroke: #FFFFFF;
  stroke-width: 5;
  stroke-miterlimit: 10;
}
.border {
  stroke-dasharray: 740;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 400ms cubic-bezier(0.600, 0.040, 0.735, 0.990);
  -webkit-transition: stroke-dashoffset 400ms cubic-bezier(0.600, 0.040, 0.735, 0.990);
  -moz-transition: stroke-dashoffset 400ms cubic-bezier(0.600, 0.040, 0.735, 0.990);
  -o-transition: stroke-dashoffset 400ms cubic-bezier(0.600, 0.040, 0.735, 0.990);
}
.border-searching .border {
  stroke-dasharray: 740;
  stroke-dashoffset: 459;
  transition: stroke-dashoffset 650ms cubic-bezier(0.755, 0.150, 0.205, 1.000);
  -webkit-transition: stroke-dashoffset 650ms cubic-bezier(0.755, 0.150, 0.205, 1.000);
  -moz-transition: stroke-dashoffset 650ms cubic-bezier(0.755, 0.150, 0.205, 1.000);
  -o-transition: stroke-dashoffset 650ms cubic-bezier(0.755, 0.150, 0.205, 1.000);
}
#search {
  font-family: 'Montserrat Alternates', sans-serif;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 120px;
  border: none;
  background: rgba(255,255,255,0);
  padding: 0 68px 0 68px;
  color: #FFFFFF;
  font-size: 1.32em;
  font-weight: 400;
  letter-spacing: -0.015em;
  outline: none;
}
#search::-webkit-input-placeholder {color: #FFFFFF;}
#search::-moz-placeholder {color: #FFFFFF;}
#search:-ms-input-placeholder {color: #FFFFFF;}
#search:-moz-placeholder {color: #FFFFFF;}
#search::-moz-selection {color: #FFFFFF; background: rgba(0,0,0,0.25);}
#search::selection {color: #FFFFFF; background: rgba(0,0,0,0.25);}
!

JS 

              
                $(document).ready(function(){
    $("#search").focus(function() {
      $(".search-box").addClass("border-searching");
      $(".search-icon").addClass("si-rotate");
    });
    $("#search").blur(function() {
      $(".search-box").removeClass("border-searching");
      $(".search-icon").removeClass("si-rotate");
    });
    $("#search").keyup(function() {
        if($(this).val().length > 0) {
          $(".go-icon").addClass("go-in");
        }
        else {
          $(".go-icon").removeClass("go-in");
        }
    });
    $(".go-icon").click(function(){
      $(".search-form").submit();
    });
});
!
999px

Console