Add some initial styling:

_layouts/post.html

@@ -55,8 +55,11 @@ <h4>Archive</h4>
     </div>
     <div class="eight columns content">
         {{ content }}
+    <footer>
+        Background image (CC BY-NC-SH) by <a href="http://huckt.deviantart.com/art/Blog-Background-001-175905139">Huckt</a>
+    </footer>
     </div>
-    <div class="three columns sidebar">
+    <div class="five columns sidebar">
         <h4>Blog Posts</h4>
         <div id="news"></div>
         <hr />

css/base.css

@@ -342,24 +342,44 @@
 
 
 /* Custom hacks */
+* {
+    -moz-box-sizing: border-box;
+    -webkit-box-sizing: border-box;
+    box-sizing: border-box;
+}
+
+body {
+    background-image: url('/images/huckt.jpg');
+    padding-top: 0.5em;
+}
+
+.container {
+    background: rgba(255, 255, 255, 0.3);
+}
+
+.sidebar {
+    background: rgba(0, 0, 0, 0.1);
+    margin-top: 0.5em;
+    padding: 0.5em;
+}
+
 hr {
     height: 1px;
     background-image: -webkit-linear-gradient(left, transparent, rgba(0, 0, 0, .1), transparent);
     background-image: -moz-linear-gradient(left, transparent, rgba(0, 0, 0, .1), transparent);
     background-image: -ms-linear-gradient(left, transparent, rgba(0, 0, 0, .1), transparent);
     background-image: -o-linear-gradient(left, transparent, rgba(0, 0, 0, .1), transparent);
     border: 0;
+    margin: 0;
+    margin-top: 0.5em;
+    margin-bottom: 0.5em;
 }
 
 #news .author, #tweets .author {
     margin-left: 1em;
 }
 
 #news dt, #tweets dt {
-    margin-top: 1em;
-}
-
-#news {
-    margin-bottom: 1em;
+    margin-top: 0.5em;
 }