JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>PSR</title>

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
    <style>
        .headerLink {
            cursor:pointer;
            color:blue;
            text-decoration:underline;
        }
    </style>
</head>

<body>
    <div id="app" class="container">


                <div class="row">
                    <table class="table table-hover" style="table-layout:fixed;width: 1000px;">
                        <thead>
                            <tr>
                                <th colspan="2" v-on:click="toggleColumns($event,'Project',1,2)" class="headerLink">Project</th>
                                <th colspan="2" v-on:click="toggleColumns($event,'Budget',1,2)" class="headerLink">Budget</th>
                                <th colspan="2" v-on:click="toggleColumns($event,'Net',1,2)" class="headerLink">Net</th>
                            </tr>
                            <tr style="word-wrap: break-word">
                                <td>Phase</td>
                                <td v-bind:class="{hidden: columnCollapsed['Project']}">SubPhase</td>
                                <td>Gross Revenue Budget</td>
                                <td v-bind:class="{hidden: columnCollapsed['Budget']}">Expenses</td>
                                <td>Net Revenue</td>
                                <td v-bind:class="{hidden: columnCollapsed['Net']}">Net Revenue Percent</td>

                            </tr>
                        </thead>
                        <tbody>
                            <tr class="well well-sm">
                               ...