<div class="ly_grid ly_grid__gap_md">
  <div class="ly_grid_col hp_fx0">
    <div>children 1</div>
  </div>
  <div class="ly_grid_col hp_fx0">
    <div>children 2</div>
  </div>
  <div class="ly_grid_col hp_fx0">
    <div>children 3</div>
  </div>
</div>