Original

404.php

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+<?php get_template_part('parts/header'); ?>
+
+<div class="container">
+
+  <div class="row visible-xs">
+    <div class="col-xs-12">
+      <button style="margin-bottom: 20px;" type="button" class="pull-right btn btn-default" data-toggle="offcanvas">Off-canvas sidebar <i class="glyphicon glyphicon-arrow-right"></i>
+      </button>
+		</div>
+  </div>
+  <div class="row row-offcanvas row-offcanvas-right">
+
+    <div class="col-xs-12 col-sm-8">
+      <div id="content" role="main">
+        <div class="alert alert-warning">
+          <h1><i class="glyphicon glyphicon-warning-sign"></i> Error 404</h1>
+          <p>The page you were looking for does not exist.</p>
+        </div>
+      </div><!-- #content -->
+    </div>
+
+    <div class="col-xs-6 col-sm-4 sidebar-offcanvas" id="sidebar" role="navigation">
+      <div class="panel panel-default">
+        <?php get_template_part('parts/sidebar'); ?>
+      </div>
+    </div>
+
+  </div><!-- .row -->
+</div><!-- .container -->
+
+<?php get_template_part('parts/footer'); ?>

category.php

@@ -0,0 +1,57 @@
+<?php get_template_part('parts/header'); ?>
+
+<div class="container">
+
+  <div class="row visible-xs">
+    <div class="col-xs-12">
+      <button style="margin-bottom: 20px;" type="button" class="pull-right btn btn-default" data-toggle="offcanvas">Off-canvas sidebar <i class="glyphicon glyphicon-arrow-right"></i>
+      </button>
+		</div>
+  </div>
+  <div class="row row-offcanvas row-offcanvas-right">
+
+    <div class="col-xs-12 col-sm-8">
+      <div id="content" role="main">
+        <header class="archive-header">
+				<h3>Blog Category: <?php single_cat_title(''); ?></h3>
+        <hr/>
+        <?php if(have_posts()): while(have_posts()): the_post();?>
+        <article role="article" id="post_<?php the_ID()?>">
+          <header>
+            <h2><a href="<?php the_permalink(); ?>"><?php the_title()?></a></h2>
+            <h4>
+              <em>
+                <span class="text-muted" class="author">By <?php the_author() ?>,</span>
+                <time  class="text-muted" datetime="<?php the_time('d-m-Y')?>"><?php the_time('jS F Y') ?></time>
+              </em>
+            </h4>
+          </header>
+          <?php the_post_thumbnail(); ?>
+          <?php the_content( __( '&hellip; Continue reading <i class="glyphicon glyphicon-arrow-right"></i>', 'bst' ) ); ?>
+          <p class="text-muted" style="margin-bottom: 20px;">
+            <i class="glyphicon glyphicon-folder-open"></i>&nbsp; Filed under: <?php _e(''); ?> <?php the_category(', ') ?><br/>
+            <i class="glyphicon glyphicon-comment"></i>&nbsp; Comments: <?php comments_popup_link('None', '1', '%'); ?>
+          </p>
+          <hr/>
+        </article>
+        <?php endwhile; ?>
+        <ul class="pagination">
+          <li class="older"><?php next_posts_link('&laquo; Older') ?></li>
+          <li class="newer"><?php previous_posts_link('Newer &raquo;') ?></li>
+        </ul>
+        <?php else: ?>
+        <?php wp_redirect(get_bloginfo('siteurl').'/404', 404); exit; ?>
+        <?php endif;?>
+      </div><!-- #content -->
+    </div>
+
+    <div class="col-xs-6 col-sm-4 sidebar-offcanvas" id="sidebar" role="navigation">
+      <div class="panel panel-default">
+        <?php get_template_part('parts/sidebar'); ?>
+      </div>
+    </div>
+
+  </div><!-- .row -->
+</div><!-- .container -->
+
+<?php get_template_part('parts/footer'); ?>