JSFiddle - React, Tailwind, and code Playground

HTML

<div class="content">
    <div class="tech">Title</div>
    <div class="tech">Description</div>
    <div class="tech">Title2</div>
    <div class="tech">Description2</div>
    <div class="tech">Title3</div>
    <div class="tech">Description3</div>
</div>

CSS

.content .tech:nth-child(2n - 1):after {
    display: inline;
    content: ':';
}

.content .tech:nth-child(2n):after {
    display: block;
    content: '';
}

.content .tech {
    display: inline;
}