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              <div class="wrap">
  <div class="lud-19 lud">
    <p class="sub-title">19. ボタンにも階層を作成しよう。</p>
    <p>Your primary action button should stand out more than secondary/danger buttons.</p>
    <div class="ex-19 example">
      <button class="b-1">キャンセル</button>
      <button class="b-2">戻る</button>
      <button class="b-3">次へ</button>
  margin: 0;
  outline: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', 'Open Sans', 'Roboto',YuGothic, "Yu Gothic", 游ゴシック体, 游ゴシック, "ヒラギノ角ゴ Pro W3", "Hiragino Kaku Gothic Pro", Roboto, メイリオ, Meiryo, "MS Pゴシック", Osaka, "MS PGothic", Arial, Helvetica, Verdana, sans-serif;

  margin: 2rem auto 0;
  width: 90%;
  max-width: 48rem;

  font-weight: normal;
  margin-bottom: 2rem;

.wrap p{
  font-size: 1.125rem;
  color: #444;
  line-height: 2;
  margin-bottom: 1rem;

.wrap a{
  color: #4687c9;

.wrap p.sub-title{
  font-size: 1.5rem;
  color: #222;
  margin-bottom: 1rem;
  line-height: 1.5;

  margin: 4rem 0 4rem;

.lud p:nth-child(3){
  font-size: 12px;
  font-style: italic;

  margin-top: 2.5rem;

/* サンプル用スタイリング */
  background: #f1f1f1;
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: flex-end;

.ex-19 button{
  border: none;
  padding: .875rem 2rem;
  border-radius: 5px;
  margin-left: 1rem;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;

.ex-19 .b-1{
  background: transparent;
  padding: .875rem .25rem;
  color: #888;

.ex-19 .b-1:hover{
  color: #222;

.ex-19 .b-2{
  background: transparent;
  border: 2px solid #aaa;
  color: hsl(200, 71%, 40%);

.ex-19 .b-2:hover{
  background: #ddd;
  color: #666;

.ex-19 .b-3{
  background: hsl(200, 71%, 46%);
  border: 2px solid hsl(200, 71%, 46%);
  color: #fff;

.ex-19 .b-3:hover{
  background: hsl(200, 71%, 40%);
  border: 2px solid hsl(200, 71%, 40%);
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