[解決済み] CSSでテキストを垂直方向にセンタリングするには？[重複しています］

#box {
  height: 170px;
  width: 270px;
  background: #000;
  font-size: 48px;
  color: #FFF;
  text-align: center;
}

<div id="box">
  Lorem ipsum dolor sit
</div>

div {
  height: 100px;
  line-height: 100px;
  text-align: center;
  border: 2px dashed #f69c55;
}

<div>
  Hello World!
</div>

div {
  height: 100px;
  line-height: 100px;
  text-align: center;
  border: 2px dashed #f69c55;
}
span {
  display: inline-block;
  vertical-align: middle;
  line-height: normal;
}

<div>
  <span>Hello World!</span>
</div>

div {
  display: table;
  height: 100px;
  width: 100%;
  text-align: center;
  border: 2px dashed #f69c55;
}
span {
  display: table-cell;
  vertical-align: middle;
}

<div>
  <span>Hello World!</span>
</div>

div {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100px;
  width: 100%;
  border: 2px dashed #f69c55;
}

<div>
  <span>Hello World!</span>
</div>