JSFiddle - React, Tailwind, and code Playground

HTML

<div style="width:80%;overflow:auto;box-sizing: border-box">
    <div style="float:left;width:100%;border-left:1px solid;">
        <div class="title">Title1</div>
        <div style="width:100%;">
            <div class="title">Title2</div>
            <div class="title">Title3</div>
        </div>
        <div style="clear:both;"></div>
    </div>
    <div>text</div>
    <div>text</div>
</div>

CSS

div.title {
    float: left;
    width:33%;
}