diff --git a/browser/components/MarkdownPreview.js b/browser/components/MarkdownPreview.js
index 98ee30d3..fb5335d5 100644
--- a/browser/components/MarkdownPreview.js
+++ b/browser/components/MarkdownPreview.js
@@ -12,7 +12,7 @@ const katex = window.katex
 const sanitizeOpts = {
   allowedTags: [ 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'blockquote', 'p', 'a', 'ul', 'ol',
   'nl', 'li', 'b', 'i', 'strong', 'em', 'strike', 'code', 'hr', 'br', 'div',
-  'table', 'thead', 'caption', 'tbody', 'tr', 'th', 'td', 'pre', 'img', 'span', 'cite', 'del', 'u' ],
+  'table', 'thead', 'caption', 'tbody', 'tr', 'th', 'td', 'pre', 'img', 'span', 'cite', 'del', 'u', 'sub', 'sup' ],
   allowedClasses: {
     'a': ['lineAnchor'],
     'div': ['math'],
diff --git a/browser/styles/mixins/marked.styl b/browser/styles/mixins/marked.styl
index 4d34005e..adc8cca8 100644
--- a/browser/styles/mixins/marked.styl
+++ b/browser/styles/mixins/marked.styl
@@ -8,6 +8,16 @@ marked()
     padding 5px
     margin -5px
     border-radius 5px
+  sup
+    position relative
+    top -.4em
+    font-size 0.8em
+    vertical-align top
+  sub
+    position relative
+    bottom -.4em
+    font-size 0.8em
+    vertical-align top
   a
     color brandColor
     text-decoration none