JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular.min.js"></script>
<label><input type=checkbox class="ins" ng-model=show ng-class='{open:show}' /><b>Show</b></label>

CSS

.ins {
       display: none;
    }
    input[type=checkbox] + b:before {
        content: ' + ';
        font-weight: 800;

    }
    input[type=checkbox]:checked + b:before {
        content:" - ";
    }

JavaScript

var myApp = angular.module('myApp', []);