body > .centerer
position: relative
-header#site_header
- margin-bottom: 15px
+#site_header
+ margin: 0 auto 15px auto
+ position: relative
+#site_header:before
+ display: block
+ background-size: 100%
+#site_header:after
+ display: block
+ position: absolute
+ bottom: 0
+ right: 0
+ padding: 4px
+ text-align: right
body > .centerer > .nav
margin-bottom: 15px