Fix styling of superscripts and subscripts. Closes #1924.

IPython/frontend/html/notebook/static/css/boilerplate.css

@@ -1,74 +1,77 b''
 /**
  * HTML5 ✰ Boilerplate
  *
  * style.css contains a reset, font normalization and some base styles.
  *
  * Credit is left where credit is due.
  * Much inspiration was taken from these projects:
  * - yui.yahooapis.com/2.8.1/build/base/base.css
  * - camendesign.com/design/
  * - praegnanz.de/weblog/htmlcssjs-kickstart
  */
 
 
 /**
  * html5doctor.com Reset Stylesheet (Eric Meyer's Reset Reloaded + HTML5 baseline)
  * v1.6.1 2010-09-17 | Authors: Eric Meyer & Richard Clark
  * html5doctor.com/html-5-reset-stylesheet/
  */
 
 html, body, div, span, object, iframe,
 h1, h2, h3, h4, h5, h6, p, blockquote, pre,
 abbr, address, cite, code, del, dfn, em, img, ins, kbd, q, samp,
 small, strong, sub, sup, var, b, i, dl, dt, dd, ol, ul, li,
 fieldset, form, label, legend,
 table, caption, tbody, tfoot, thead, tr, th, td,
 article, aside, canvas, details, figcaption, figure,
 footer, header, hgroup, menu, nav, section, summary,
 time, mark, audio, video {
   margin: 0;
   padding: 0;
   border: 0;
   font-size: 100%;
   font: inherit;
   vertical-align: baseline;
 }
 
+sup { vertical-align: super; }
+sub { vertical-align: sub; }
+
 article, aside, details, figcaption, figure,
 footer, header, hgroup, menu, nav, section {
   display: block;
 }
 
 blockquote, q { quotes: none; }
 
 blockquote:before, blockquote:after,
 q:before, q:after { content: ""; content: none; }
 
 ins { background-color: #ff9; color: #000; text-decoration: none; }
 
 mark { background-color: #ff9; color: #000; font-style: italic; font-weight: bold; }
 
 del { text-decoration: line-through; }
 
 abbr[title], dfn[title] { border-bottom: 1px dotted; cursor: help; }
 
 table { border-collapse: collapse; border-spacing: 0; }
 
 hr { display: block; height: 1px; border: 0; border-top: 1px solid #ccc; margin: 1em 0; padding: 0; }
 
 input, select { vertical-align: middle; }
 
 
 /**
  * Font normalization inspired by YUI Library's fonts.css: developer.yahoo.com/yui/
  */
 
 body { font:13px/1.231 sans-serif; *font-size:small; } /* Hack retained to preserve specificity */
 select, input, textarea, button { font:99% sans-serif; }
 
 /* Normalize monospace sizing:
    en.wikipedia.org/wiki/MediaWiki_talk:Common.css/Archive_11#Teletype_style_fix_for_Chrome */
 pre, code, kbd, samp { font-family: monospace, sans-serif; }
 
 em,i { font-style: italic; }
 b,strong { font-weight: bold; }