JSFiddle - React, Tailwind, and code Playground

HTML

<div class="row">
  <div class="order__minus">-</div>
  <input type="number" class="order__input-number">
  <div class="order__plus">+</div>
</div>
<div class="row">
  <div class="order__minus">-</div>
  <input type="number" class="order__input-number">
  <div class="order__plus">+</div>
</div>

CSS

.row {
  margin: 20px 0;
}

JavaScript

$(".order__plus").click(function() {
  $(".order__input-number").val(+$(".order__input-number").val() + 1);
});