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<div class="outer">
  <div class="inner">
    Hello World
  </div>
</div>

/* 初期設定 */
.outer {
  
  background: #bfff7f;
  height: 250px;
}

.inner {

  background: #7fffff;
  height: 200px;
}

/* 中央揃え */
.outer {
  
  display: flex;
  justify-content: center;
  align-items: center;
}

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