Woocommerce Plus Minus Quantity Buttons

style.scss

.quantity {
  display: flex;
  border: 1px solid rgba(11, 11, 11, 0.1);
  width: 90px;

  .qty {
    padding: 10px;
    border: 0;
    background-color: transparent;
    -moz-appearance: textfield;
    padding: 0;
    width: 40px;
    height: 52px;
    text-align: center;

    &::-webkit-outer-spin-button,
    &::-webkit-inner-spin-button {
      -webkit-appearance: none;
      margin: 0;
    }
  }
}

button.plus,
button.minus {
  background-color: transparent;
  color: #a8afb5;
  border: 0;
  display: block;
  width: 25px;
  padding: 0;

  &:hover,
  &:focus {
    color: #000;
    border: 0;
    outline: none;
  }
}

woo-plus-minus-qty-btn.php

<?php
/*
 * Show plus button
 */
add_action( 'woocommerce_after_quantity_input_field', 'gl_asiq_display_quantity_plus' );
function gl_asiq_display_quantity_plus() {
	echo '<button type="button" class="plus">+</button>';
}

/*
 * Show minus button
 */
add_action( 'woocommerce_before_quantity_input_field', 'gl_asiq_display_quantity_minus' );
function gl_asiq_display_quantity_minus() {
	echo '<button type="button" class="minus">-</button>';
}

/*
 * Trigger update quantity script
 */
add_action( 'wp_footer', 'gl_asiq_add_cart_quantity_plus_minus' );
function gl_asiq_add_cart_quantity_plus_minus() {
	if ( ! is_product() && ! is_cart() ) {
		return;
	}
	?>
	<script>
		jQuery( document ).on( 'click', 'button.plus, button.minus', function () {
			var qty = jQuery( this ).parent( '.quantity' ).find( '.qty' );
			var val = parseFloat( qty.val() );
			var max = parseFloat( qty.attr( 'max' ) );
			var min = parseFloat( qty.attr( 'min' ) );
			var step = parseFloat( qty.attr( 'step' ) );
			
			if ( jQuery( this ).is( '.plus' ) ) {
				if ( max && (
					max <= val
				) ) {
					qty.val( max ).change();
				} else {
					qty.val( val + step ).change();
				}
			} else {
				if ( min && (
					min >= val
				) ) {
					qty.val( min ).change();
				} else if ( val > 1 ) {
					qty.val( val - step ).change();
				}
			}
		} );
	</script>
	<?php
}