<!-- CUSTOM QUANTITY BUTTONS -->
<style>
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
	-webkit-appearance: none;
	margin: 0;
}
</style>

<!-- CUSTOM QUANTITY BUTTONS --> 
<script>
$('.INCREMENT-CLASS').click(function() {
  var $input = $(this).parents('.QUANTITY-GROUP-CLASS').find('.QUANTITY-NUMBER-FIELD-CLASS');
  var val = parseInt($input.val(), 10);
  $input.val(val + 1);
});

$('.DECREMENT-CLASS').click(function() {
  var $input = $(this).parents('.QUANTITY-GROUP-CLASS').find('.QUANTITY-NUMBER-FIELD-CLASS');
  var val = parseInt($input.val(), 10);
  $input.val(Math.max(val - 1, 1));
})
</script>