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HTML

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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

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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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Packages

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HTML 

              
                    <div class="wrapper">  
      <ul class="list">
        <li class="items"><img src="http://kenichiro.mixh.jp/study/assets/img/roundbox_01.jpg" alt=""></li>
        <li class="items"><img src="http://kenichiro.mixh.jp/study/assets/img/roundbox_02.jpg" alt=""></li>
        <li class="items"><img src="http://kenichiro.mixh.jp/study/assets/img/roundbox_03.jpg" alt=""></li>
        <li class="items"><img src="http://kenichiro.mixh.jp/study/assets/img/roundbox_04.jpg" alt=""></li>
        <li class="items"><img src="http://kenichiro.mixh.jp/study/assets/img/roundbox_05.jpg" alt=""></li>
      </ul>

    </div>
!

CSS 

              
                ul.list {
  display: flex; // 1.リストアイテムを横並びにする
  // width: 88%; //3.今回は不採用
  // margin: 0 auto; //3.今回は不採用
  margin: 0 6%; //3.リスト自体の左右に余白を作る
  flex-wrap: wrap; //4.横並びになったリストアイテムを折り返す
}
li.items {
  margin-left: 7px; //5.画像と画像の間に余白を設定する
  &:first-child {
    margin-left: 0;
  }
  width: calc((100% - 28px) / 5); // 6.画像と画像間の余白を1列に収める
}
img {
  width: 100%; // 2.画像が要素内で100%のサイズで表示される様にする
}

////////////共通設定////////////
ul {
  background: #B3CFDA;
  margin: 0;
  padding: 0;
}
li {
  background: #F6BFC7;
  margin-bottom: 10px;
}
.wrapper {
  width: 600px;
  margin: 0 auto;
  margin-top: 30px;
  padding-top: 10px;
  background: #C1E7B8;
  text-align: center;
}
li {
  list-style: none;
}
img {
  //画像の下に出来る隙間を消すための設定
  vertical-align: bottom;
}
!

JS
!
999px

Console