body {font-family:"ヒラギノ角ゴ Pro W3","メイリオ",sans-serif;
        background-color: #483d8b;
        background-image: url();
line-height:220%;
        margin-top:0px;}

/*記事*/

article {background-color:#ffffff;
         width: 100%;
        margin-left: auto;
        margin-right: auto;
       border: solid 1px #ffffff;
      padding: 0px;
      -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
     box-sizing: border-box;
 margin-top:0px;
 margin-bottom:10px;

overflow: hidden

-webkit-text-size-adjust: 100%
}





h1 {clear: both;
font-size: 20px;
text-align: center;
 margin-top: 5px;
       margin-bottom:0px;
}


/*小見出し*/
h2 {clear: both;
font-size: 18px;
border-bottom:solid 3px #4b0082;
text-align: center;
  margin-bottom: 20px;
margin-top: 10px}


h3 {font-family:"ヒラギノ角ゴ Pro W3","メイリオ",sans-serif;
          font-size: 16px;
         width: 90%;
         margin-left: auto;
         margin-right: auto;
         text-align: center;
       margin-top: 0px;
       margin-bottom: 15px;
       color: #4b0082}



h4  {clear: both;
font-size: 18px;
border-bottom:solid 3px #4b0082;
text-align: left;
  margin-bottom: 20px;
margin-top: 10px}




article p {
font-size: 14px;
 line-height:1.5em;
width: 90%;
color: #333333;
margin: 3px;
margin-top:10px;
margin-left: auto;
margin-right: auto;
      }

   .hidden {
        display: none; /* メニューを非表示にする */
    }
    /* 必要に応じて、メニューが開いた時に表示させるスタイルも追加 */
    /* 例：.visible { display: block; } */



/*リンクの色*/
a {color: #000000}

a:hover {color: #8a2be2}

a img {border: none}



small {
       color: #4952f5;}

/*ニュースのかこみ*/

article {border: solid 1px #aaaaaa;
border-radius: 5px;
padding: 50px;
background-color: #ffffff;
margin-top: 10px}



/*ナビゲーションメニュー*/
nav ul {list-style-type: none;
margin-top:5px;
margin-bottom: 5px;
padding-left: ;
font-size: 0}

nav li {display:  block;
font-size: 16px;
 border-bottom: solid 1px #aaaaaa; 
padding-left: 10px;
padding-right: 10px}



nav {width: 96%;
margin-left: auto;
margin-right: auto;
text-align: center;
margin-top: 10px;
margin-bottom: 10px}

nav a {color: #333333;
text-decoration: none}


/*その他と主な共通部分は省略*/

a.btn-radius-solid {
  border: 1px solid #ccc;
  background: #f1e767;
  background: -webkit-gradient(linear, left top, left bottom, from(#fdfbfb), to(#ebedee));
  background: -webkit-linear-gradient(top, #fdfbfb 0%, #ebedee 100%);
  background: linear-gradient(to bottom, #fdfbfb 0%, #ebedee 100%);
  -webkit-box-shadow: inset 1px 1px 1px #fff;
  box-shadow: inset 1px 1px 1px #fff;
}

a.btn-radius-solid:hover {
  background: -webkit-gradient(linear, left bottom, left top, from(#fdfbfb), to(#ebedee));
  background: -webkit-linear-gradient(bottom, #fdfbfb 0%, #ebedee 100%);
  background: linear-gradient(to top, #fdfbfb 0%, #ebedee 100%);
}
/*もくじ*/


.btn,
a.btn,
button.btn {
  font-size: 0.7rem;
  font-weight: 700;
  line-height: 1.1;
  position: relative;
  display: inline-block;
  padding: 0.5rem 0.5rem;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  text-align: center;
  vertical-align: middle;
  text-decoration: none;
  letter-spacing: 0.1em;
  color: #000000;
  border-radius: 0.5rem;
}

/*ボタンデザイン*/

a.btn-border {
  border: 2px solid #666666;
  border-radius: 0;
  background: #ffffff;
}

a.btn-border:hover {
  color: #ffffff;
  background: #999999;
}


 <section class="amazon-section">

/* ===== PC版の設定 ===== */