Merge pull request #2768 from rtfd/center-404-text

Center 404 copy in a janky way :)

Author: ericholscher

readthedocs/donate/static/donate/css/donate.css

@@ -0,0 +1,6 @@
+#promo_404 {
+    margin-left: auto;
+    margin-right: auto;
+    width: 900px;
+    text-align: center
+}

readthedocs/donate/templates/donate/promo_404.html

@@ -1,6 +1,6 @@
 {% extends "base.html" %}
 {% load core_tags %}
-{% load i18n %}
+{% load static i18n %}
 
 {% block title %}
   {% trans "Maze Found" %}
@@ -10,7 +10,12 @@
   {% include "error_header.html" %}
 {% endblock %}
 
+{% block extra_links %}
+  <link rel="stylesheet" href="{% static 'donate/css/donate.css' %}" />
+{% endblock %}
+
 {% block content %}
+<div id="promo_404">
     {% if suggestion %}
       <div class="suggestions">
           <h1>You've found something that doesn't exist.</h1>
@@ -41,4 +46,5 @@ <h1>
 <p>
 Read the Docs is sponsored by <a href="{{ promo_data.link }}">Sentry</a>, which gives developers the tools to keep calm when things catch fire.
 </p>
+</div>
 {% endblock %}