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  <div class="parallax">
    <h1>Site title</h1>


html {
  height: 100%;
  margin: 0 auto;

.parallax {
  box-sizing: border-box;
  color: #FFF;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 5%;

body::before {
  background: url('') no-repeat center;/* 擬似要素に背景画像 */
  background-size: cover;/* cover指定 */
  content: "";/* 画像を表示させる為に必要*/
  display: block;/*ブロックボックスで表示*/
  position: fixed;/* 擬似要素全体を固定 */
  width: 100%;/* 横幅を画面全体 */
  height: 100vh;/* 縦幅を画面全体 */
  top: 0;/* 上からの配置を0 */
  left: 0;/* 左からの配置を0 */
  z-index: -1;/*背景画像になるように重ね順を-1*/