JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">

<div class="width-100">
<h2>Header H2</h2>
<p>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur suscipit fermentum congue. Sed ac viverra velit, eu sollicitudin justo.
</p>
</div>

<!----- 2-kolumner start ------>

<div class="width-50">
<h2>Header H2</h2>
<p>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur suscipit fermentum congue. Sed ac viverra velit, eu sollicitudin justo.
</p>
</div>

<div class="width-50">
<h2>Header H2</h2>
<p>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur suscipit fermentum congue. Sed ac viverra velit, eu sollicitudin justo.
</p>
</div>

<!----- 3-kolumner start ------>

<div class="width-33">
<h2>Header H2</h2>
<p>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur suscipit fermentum congue. Sed ac viverra velit, eu sollicitudin justo.
</p>
</div>

<div class="width-33">
<h2>Header H2</h2>
<p>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur suscipit fermentum congue. Sed ac viverra velit, eu sollicitudin justo.
</p>
</div>

<div class="width-33">
<h2>Header H2</h2>
<p>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur suscipit fermentum congue. Sed ac viverra velit, eu sollicitudin justo.
</p>
</div>

</div>

CSS

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 15px;
  overflow: auto;
  background: #e1e1e1;
}
.width-100, .width-50, .width-33 {
  float: left;
  padding: 10px;
  box-sizing: border-box;
}
.width-100 {
  width: 100%;
}
.width-50 {
  width: 50%;
}
.width-33 {
  width: 33.333%;
}