JSFiddle - React, Tailwind, and code Playground

HTML

<button id="orderconfirm">test</button>

<input class="new_order" type="checkbox" />
<input class="new_order" type="checkbox" />
<input class="new_order" type="checkbox" />

CSS

.highlight:after {
    display:block;
    content: "highlight";
    padding-left:15px;
}

JavaScript

$('#orderconfirm').click(function () {
  $('.new_order').each(function(){
     if($(this).prop('checked') === false) {
        $(this).addClass('highlight');
     }
  });
});