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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.

!
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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You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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HTML 

              
                <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

<div class="choose_box">
  
<div id="q_01" class="fit">
 <p>質問1</p>
<ul class="flexbox fw">
<li class="even"><a class="btn" href="#q_02">選択肢1</a></li>
<li class="odd"><a class="btn" href="#q_03">選択肢2</a></li>
<li class="odd"><a class="btn" href="#q_04">選択肢3</a></li>
<li class="odd"><a class="btn" href="#q_05">選択肢4</a></li>
</ul>
 </div>
 <!-- 最初の選択肢 -->
  
<div id="q_02" style="display: none;">
<p>質問2？</p>
<ul class="flexbox fw">
<li class="even"><a class="btn" href="#q_06">選択肢1-1</a></li>
<li class="odd"><a class="btn" href="#q_07">選択肢1-2</a></li>
</ul>
</div>
<!-- 次の選択肢 --> 
 
<div id="q_03" style="display: none;">
<p>質問2？</p>
<ul class="flexbox fw">
<li class="even"><a class="btn" href="#q_06">選択肢2-1</a></li>
<li class="odd"><a class="btn" href="#q_07">選択肢2-2</a></li>
</ul>
</div>
<!-- 次の選択肢 --> 
  
<div id="q_04" style="display: none;">
<p>質問2？</p>
<ul class="flexbox fw">
<li class="even"><a class="btn" href="#q_06">選択肢3-1</a></li>
<li class="odd"><a class="btn" href="#q_07">選択肢3-2</a></li>
</ul>
</div>
<!-- 次の選択肢 --> 
  
 <div id="q_05" style="display: none;">
<p>質問2？</p>
<ul class="flexbox fw">
<li class="even"><a class="btn" href="#q_06">選択肢4-1</a></li>
<li class="odd"><a class="btn" href="#q_07">選択肢4-2</a></li>
</ul>
</div>
<!-- 次の選択肢 -->
  
  
 <div id="q_06" style="display: none;">
        <p>あなたにおすすめなのは…</p>
        <h4>『答え①』です！！</h4>
   <span><a class="btn" href="#q_01">もどる</a></span>
</div>
 
<!-- 選択肢の答え① -->
  
  <div id="q_07" style="display: none;">
        <p>あなたにおすすめなのは…</p>
        <h4>『答え②』です！！</h4>
     <span><a class="btn" href="#q_01">もどる</a></span>
</div>
 
<!-- 選択肢の答え② -->
</div>
!

CSS 

              
                body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Segoe UI", "Yu Gothic", YuGothic, sans-serif;
}

.choose_box {
  position: relative;
  height: 50vw;
  width: 100%;
}
 .choose_box p {
    font-size: 24px;
    display: block;
    font-weight: 600;
    text-align: center;
  }

.choose_box ul {
    width: 80%;
    text-align: center;
    margin: auto;
   display:flex;
  flex-wrap: wrap;
}
.choose_box ul li {
  width: calc(100% / 2 - 20px);
  margin-right: 20px;
  margin-bottom: 20px;
  list-style: none;
}

.choose_box ul li:nth-child(2n) {
   margin-right: 0;
}
.choose_box ul li a {
  color: #fff;
  display: block;
  padding: 20px 60px;
  text-align: center;
  background-color: #2791d4;
  font-weight: 600;
  font-size: 18px;
  border: 2px solid #2791d4;
  text-decoration: none;
  -webkit-border-radius: 6px;
  -moz-border-radius: 6px;
  border-radius: 6px;
}

.choose_box ul li a:hover {
   background-color: #fff;
  color: #2791d4;
    -webkit-transition: 0.7s;
    -moz-transition: 0.7s;
    -o-transition: 0.7s;
    transition: 0.7s;
}

h4 {
    width: 50%;
    clear: both;
    margin: auto;
    padding: 20px;
    text-align: center;
    font-size: 24px;
    font-weight: 600;
    color: #fff;
    text-align: center;
  background-color: #C00003;
  }

.fit {
  position: absolute;
  left: 0px;
  top: 20px;
  width: 100%;
}
#q_06 span,#q_07 span {
  display: block;
  width:100%;
}
#q_06 a,#q_07 a {
  display: block;
  width:100%;
  text-align: center;
}
!

JS 

              
                	$(function () {
		$(".btn").on("click", function () {
			$(this).closest("div").css("display", "none");
			id = $(this).attr("href");
			$(id).addClass("fit").show("slow");
		});
	});
!
999px

Console