JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
    <span>Lorem ipsum dolor sit amet.</span>
</div>

CSS

body{
    /*重置浏览器默认样式，避免测试结果受影响*/
    font-size:12px;
    line-height: 1;
}
.wrapper{
    background-color:#0e51a7;
}
span{
    font-size:12px;
    line-height:5px; /*line-height 小于 font-size*/
    background-color: #ff9e00;
    vertical-align:middle;/*设成middle可以看的更清楚*/
}