JSFiddle - React, Tailwind, and code Playground

HTML

<div class="forall">
    <div class="inText">Hello g World /With font-size 20px
        <div class="strut"></div>
    </div>
</div>
<div class="forall">
    <div>Hello g World / Without font-size
        <div class="strut"></div>
    </div>
</div>
<div class="forall">
    <div class="intext2">Hello g World / with font-size:9px
        <div class="strut"></div>
    </div>
</div>

CSS

div.forall {
    width: 600px;
    height: 20px;
    border: thin black solid;
    background-color: #9BBCE3;
    margin: 10px;
}
.inText {
    font-size: 20px;
    line-height: 20px;
}
.intext2 {
    font-size: 9px;
    line-height: 9px;
}
.strut {
    height: 20px;
    display: inline-block;
}