<div class="d-flex bd-highlight">
  <div class="p-2 flex-grow-1 bd-highlight">Flex item</div>
  <div class="p-2 bd-highlight">
 <input type="number" style="width: 10%" class="form-control float-right">

</div>
  <button type="button" onclick="add_to_cart_button(1);" class=" btn btn-info default float-right mb-1"><span class="simple-icon-basket"></span></button>
</div>