JSFiddle - React, Tailwind, and code Playground

HTML

<div class="tabs">
	<div class="gwt-HTML tab">1</div>
	<div class="gwt-HTML tab">2</div>
	<div class="gwt-HTML tab">3</div>
	<div class="gwt-HTML tab">4</div>
	<div class="gwt-HTML tab">5</div>
</div>

CSS

body {
	width: 300px;
}

.tabs {
	width: 100%;
    display: flex;
    display: -webkit-flex;
    flex-wrap: wrap;
    -webkit-flex-wrap: wrap;
    flex: 0 0 auto;
    -webkit-flex: 0 0 auto;
    box-sizing: border-box;
    flex-flow: row wrap;
    -webkit-flex-flow: row wrap;
}

.tab {
    border: 1px solid #3A3A3A;
    color: #929292;
	min-width: 50%;
	box-sizing: border-box;
	flex: 1 1 0;
    -webkit-flex: 1 1 0;
	text-align: center;
}