Add bibliography styles

assets/sass/csl-bib.sass

@@ -0,0 +1,7 @@
+@import "_theme.sass"
+
+.csl-right-inline
+  margin-left: 1.5em !important
+a[href*=citeproc]
+  vertical-align: super
+  font-size: .83em

assets/sass/style.sass

@@ -1,6 +1,7 @@
 @import "syntax.scss"
 @import "stork.sass"
 @import "soudan.sass"
+@import "csl-bib.sass"
 @import "_theme.sass"
 @import "_topography.sass"
 
@@ -72,10 +73,13 @@ a
     text-decoration: none
 pre, .page
   box-shadow: $shadow-size $shadow-size $shadow
-img, button, input[type=submit]
+img, button, input[type=submit], iframe
   max-width: 100%
   box-shadow: $shadow-size $shadow-size $bg0
   border: 2px solid $bg0
+iframe
+  display: block
+  margin: auto
 header
   h2
     margin: 0