how to remove all children ::after styles

html looks like:

<div class='a'>
  <p class='subA'><p>
  <p class='subA'><p>
</div>
<div class='b'>
  <p class='subA'><p>
  <p class='subA'><p>
<div>

how to remove .subA::after styles for only div with class ‘a’?