<!-- ↓フォントオーサム↓ -->
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.2.0/css/all.css" integrity="sha384-hWVjflwFxL6sNzntih27bfxkr27PmbbK/iSvJ+a4+0owXq79v+lsFkW54bOGbiDQ" crossorigin="anonymous">

<!-- ここから! -->
<div class="whole-book-box">
	 <section class="book-image">
	 	 <img src="http://gahag.net/img/201608/26s/gahag-0119028908-1.png"/ height="230">
	 </section>
	 <article class="book-detail">
	 	<h3>タイトル ライフ カクメイ♪(ライフカクメイ社)</h3>
		<p class="book-price">100円</p>
		<a href="#" class="perchase-button"><i class="fas fa-shopping-cart"> </i>購入する</a>
	 </article>
</div>
.whole-book-box{
  border:3px solid green;
}

.book-image{
  margin: 25px;
}

.book-detail{
  margin:25px;
}

.book-detail h3{
  border-left: 3px solid blue;
  padding-left:10px;
}

.book-price{
  margin:30px 0px;
  font-size:20px;
}

a.perchase-button {
  display: inline-block;
  padding: 7px 20px 7px 20px;
  border-radius: 15px;
  text-decoration: none;
  color: #FFF;
  background-image: -webkit-linear-gradient(45deg, #FFC106 0%, #ff8b5f 100%);
  background-image: linear-gradient(45deg, #FFC106 0%, #ff8b5f 100%);
  transition: .5s;
}

a.perchase-button:hover {
  background-image: -webkit-linear-gradient(45deg, #FFC107 0%, #f76a35 100%);
    background-image: linear-gradient(45deg, #FFC107 0%, #f76a35 100%);
}

@media ( min-width : 600px ){
    .whole-book-box{
      display: flex;
      display: -webkit-flex;
  }
    .book-image{
      margin: 25px;
  }
    .book-detail{
      margin: 25px;
  }
}

External CSS

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External JavaScript

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