JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<body>

<results-filter>
	<bs-drop-button>
    	<span class="btn-primary">btnPrimary</span>
      <span class="btn-primary btn-micro">btnMicro</span>
  </bs-drop-button>
</results-filter>

</body>
</html>

CSS

body results-filter bs-drop-button .btn-primary:not(.btn-micro) {
	color: red;
}