JSFiddle - React, Tailwind, and code Playground

HTML

<div class="nested-fields">
  <div class="nested-fields--form">One</div>
  <div>Other random Div-Element</div>
  <div class="nested-fields--form">Two</div>
  <div class="nested-fields--form">Three</div>
</div>

CSS

.nested-fields--form:nth-of-type(1) {
  background: red;
}

.nested-fields--form:nth-of-type(3) {
  background: red;
}