404 page ui update (#313)

Author: Arhell

404.html

@@ -4,9 +4,11 @@
 permalink: /404.html
 ---
 
-<h1>Page not found.</h1>
-<p>Sorry – the page you're looking for doesn't exist.</p>
-<p>Perhaps you typed the URL incorrectly, or it may have moved.</p>
-<p><a href="/">Back To Home</a></p>
+<div class="container container-error">
+  <h1>Page not found.</h1>
+  <p>Sorry – the page you're looking for doesn't exist.</p>
+  <p>Perhaps you typed the URL incorrectly, or it may have moved.</p>
+  <p><a href="/">Back To Home</a></p>
+</div>>
 
 

css/codeception.css

@@ -1593,4 +1593,9 @@ body #footer .links {
 
 .panel-group--phar pre {
 	margin-bottom: 0;
+}
+
+.container-error {
+	margin: 80px auto;
+	text-align: center;
 }