JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <div class="a">1a</div>
    <div class="a">2a</div>
    <div class="a">3a</div>
    <div class="b">1b</div>
    <div class="b">2b</div>
    <div class="a">4a</div>
</div>

CSS

.b + .b {
    color:red;
}