JSFiddle - React, Tailwind, and code Playground

by kazu69

HTML

<div class="a">
  <div class="b">
    <div class="c"><!-- 高さ50px -->
      <h1>これを高さ中央寄せにしたい</h1>
    </div>
  </div>
</div>

CSS

.b {
    background: #ddd;
    height: 120px;
}

.c {
    background: #999;
    height: 50px;
    position: relative;
}

h1 {
    /* 真ん中中央寄せ */
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    position: absolute;
    
    /* 適当な設定 */
    background: #0a0;
    font-size: 12px;
    height: 20px;
    width: 200px;
}