JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<script src="//cdnjs.cloudflare.com/ajax/libs/masonry/3.1.5/masonry.pkgd.min.js"></script>
<!-- Header -->
<header id="header" class="container">
  <h1>Bootstrap 3 + Masonry 3</h1>
  <p class="lead">
    This is deployed with the <code>#grid</code> div fluid (that is, it has no Bootstrap <code>.container</code> class). To make it fixed simply add the <code>.container</code> class to it. Use the media queries in <strong>style.css</strong> to change
    the grid's post widths and margins.
  </p>
  <hr>
</header>
<!-- Posts -->
<!-- <div id="grid" class="container"> -->
<div id="grid">
  <div id="posts">
    <div class="post">
      <img src="http://placehold.it/600x400"><br>
      <br>
      <strong>Title Goes Here</strong><br>
      <small>Category</small>
    </div>
    <div class="post">
      <img src="http://placehold.it/400x600"><br>
      <br>
      <strong>Title Goes Here</strong><br>
      <small>Category</small>
    </div>
    <div class="post">
      <img src="http://placehold.it/600x400"><br>
      <br>
      <strong>Title Goes Here</strong><br>
      <small>Category</small>
    </div>
    <div class="post">
      <img src="http://placehold.it/400x600"><br>
      <br>
      <strong>Title Goes Here</strong><br>
      <small>Category</small>
    </div>
    <div class="post cs2">
      <img src="http://placehold.it/600x400"><br>
      <br>
      <strong>Title Goes Here</strong><br>
      <small>Category</small>
    </div>
    <div class="post">
      <img src="http://placehold.it/400x600"><br>
      <br>
      <strong>Title Goes Here</strong><br>
      <small>Category</small>
    </div>
    <div class="post">
      <img src="http://placehold.it/600x400"><br>
      <br>
      <strong>Title Goes Here</strong><br>
      <small>Category</small>
    </div>
    <div class="post">
    ...

CSS

/* Default tags and Bootstrap classes */

body {
  font-family: 'PT Sans Caption', sans-serif;
  color: #000099;
  padding: 40px 0;
}

.lead {
  padding: 40px 0;
}

/* Grid */

#posts {
  margin: 30px auto 0;
}

.post {
  margin: 0 0 50px;
  text-align: center;
  width: 100%;
}

.post img {
  padding: 0 15px;
  width: 100%;
}

#grid.container .post img {
  padding: 0;
}

/* Medium devices */

@media (min-width: 768px) {
  #grid>#posts .post {
    width: 335px;
  }
  #grid>#posts .post.cs2 {
    width: 100%;
  }
  .post img {
    padding: 0;
  }
}

/* Medium devices */

@media (min-width: 992px) {
  #grid>#posts .post {
    width: 445px;
  }
  #grid>#posts .post.cs2 {
    width: 100%;
  }
}

/* Large devices */

@media (min-width: 1200px) {
  #grid>#posts .post {
    width: 346px;
  }
  #grid>#posts .post.cs2 {
    width: 742px;
  }
}

/* Large devices min-width (1200px) + a .post margin (50px) * 2 (100px) = 1300px */

/* 1300px gives me the clearance I need to keep the margins of the entire #grid (the
bleed if you will) the same width as the .post margins posts (50px). Basically I'm
being really picky about whitespace. If you don't care, no problem, just delete this.
Can this be done with Masonry options? */

@media (min-width: 1300px) {
  #grid {
    left: -50px;
    padding-left: 50px;
    padding-right: 50px;
    position: relative;
  }
  #grid.container {
    left: auto;
    padding-left: 15px;
    padding-right: 15px;
  }
}

JavaScript

// Load is used to ensure all images have been loaded, impossible with document

jQuery(window).load(function() {



  // Takes the gutter width from the bottom margin of .post

  var gutter = parseInt(jQuery('.post').css('marginBottom'));
  var container = jQuery('#posts');



  // Creates an instance of Masonry on #posts

  container.masonry({
    gutter: gutter,
    itemSelector: '.post',
    columnWidth: '.post'
  });
  // This code fires every time a user resizes the screen and only affects .post elements
  // whose parent class isn't .container. Triggers resize first so nothing looks weird.
  jQuery(window).bind('resize', function() {
    if (!jQuery('#posts').parent().hasClass('container')) {
      // Resets all widths to 'auto' to sterilize calculations
      post_width = jQuery('.post').width() + gutter;
      jQuery('#posts, body > #grid').css('width', 'auto');
      // Calculates how many .post elements will actually fit per row. Could this code be cleaner?
      posts_per_row = jQuery('#posts').innerWidth() / post_width;
      floor_posts_width = (Math.floor(posts_per_row) * post_width) - gutter;
      ceil_posts_width = (Math.ceil(posts_per_row) * post_width) - gutter;
      posts_width = (ceil_posts_width > jQuery('#posts').innerWidth()) ? floor_posts_width : ceil_posts_width;
      if (posts_width == jQuery('.post').width()) {
        posts_width = '100%';
      }
      // Ensures that all top-level elements have equal width and stay centered
      jQuery('#posts, #grid').css('width', posts_width);
      jQuery('#grid').css({
        'margin': '0 auto'
      });
    }
  }).trigger('resize');


});