doc/style: use default font color specified by user

* it's bad to specify only foreground color:
  http://www.w3.org/QA/Tips/color
* some people prefer dark background
* `color:  #111' is mostly the same as `color: black',
  which is the default of almost all popular browsers.

so it's preferable to delete `color:  #111', rather than adding
`background-color: white'.

doc/style.css

@@ -1,298 +1,297
 /*
  * Styles for man pages, which match with http://mercurial.selenic.com/
  *
  * Color scheme & layout are borrowed from
  * http://mercurial.selenic.com/css/styles.css
  *
  * Some styles are from html4css1.css from Docutils, which is in the
  * public domain.
  */
 
 body {
     margin: 0;
     padding: 0;
     font-family: sans-serif;
-    color: #111;
 }
 
 .document {
     position: relative;  /* be a top of absolute positioning */
     margin: 1.5em 1.8em;
     padding: 0;
     line-height: 1.3;
 }
 
 /* layout: toc to right */
 #contents {
     position: absolute;
     right: 0;
     top: 0;
     width: 26%;
 }
 
 /* layout: others to left */
 h1.title, h2.subtitle, .section { width: 72%; }
 .section .section { width: auto; }
 table.docinfo { max-width: 72%; }
 
 /* headings */
 h1, h2, .topic-title, .admonition-title {
     font-family: "MgOpen Cosmetica", "Lucida Sans Unicode", sans-serif;
     font-weight: normal;
 }
 h1, h2, .topic-title, .admonition-title {
     margin: 1em 0 0.5em;
 }
 h1.title { font-size: 300%; }
 h2.subtitle, h1 { font-size: 200%; }
 h2, .topic-title, .admonition-title { font-size: 140%; }
 
 /* subtitle starts with lowercase in man pages, but not in HTML */
 h2.subtitle:first-letter { text-transform: uppercase; }
 
 /* override first/last margin */
 .first, h1.title, h2.subtitle { margin-top: 0 !important; }
 .last, .with-subtitle { margin-bottom: 0 !important; }
 
 blockquote, pre, dd .option-list, .field-list {
     margin: 0.2em 0 1em 2em;
 }
 
 kbd, tt, pre { font-family: monospace; }
 
 dt { font-weight: bold; }
 dd { margin-bottom: 0.5em; }
 
 th, td { padding: 0.1em 0.2em; border: 0 none; }
 th { font-weight: bold; text-align: left; }
 
 a:link, a:visited { text-decoration: underline; }
 a:hover, a:focus { text-decoration: none; }
 a:link { color: #00b5f1; }
 a:visited { color: #5c9caf; }
 a:link.toc-backref, a:visited.toc-backref {
     text-decoration: none;
-    color: #111;  /* `inherit' is not supported by IE6 */
+    color: inherit;  /* NOTE: `inherit' is not supported by IE6 */
 }
 
 div.admonition, div.attention, div.caution,
 div.danger, div.error, div.hint, div.important,
 div.note, div.tip, div.warning {
     border-top: 1px #ccc solid;
     border-bottom: 1px #ccc solid;
     padding: 0.3em 1em;
     margin: 1em;
 }
 
 
 /*
  * The following styles are from docutils'.
  * Please refine if necessary.
  */
 
 table.borderless td, table.borderless th {
     /* Override padding for "table.docutils td" with "! important".
        The right padding separates the table cells. */
     padding: 0 0.5em 0 0 ! important;
 }
 
 .hidden {
     display: none;
 }
 
 blockquote.epigraph {
     margin: 2em 5em;
 }
 
 div.abstract {
     margin: 2em 5em;
 }
 
 div.dedication {
     margin: 2em 5em;
     text-align: center;
     font-style: italic;
 }
 
 div.figure {
     margin-left: 2em;
     margin-right: 2em;
 }
 
 div.footer, div.header {
     clear: both;
     font-size: smaller;
 }
 
 div.line-block {
     display: block;
     margin-top: 1em;
     margin-bottom: 1em;
 }
 
 div.line-block div.line-block {
     margin-top: 0;
     margin-bottom: 0;
     margin-left: 1.5em;
 }
 
 div.sidebar {
     margin: 0 0 0.5em 1em;
     border: medium outset;
     padding: 1em;
     background-color: #ffffee;
     width: 40%;
     float: right;
     clear: right;
 }
 
 div.sidebar p.rubric {
     font-family: sans-serif;
     font-size: medium;
 }
 
 div.system-messages {
     margin: 5em;
 }
 
 div.system-messages h1 {
     color: red;
 }
 
 div.system-message {
     border: medium outset;
     padding: 1em;
 }
 
 div.system-message p.system-message-title {
     color: red;
     font-weight: bold;
 }
 
 h1.section-subtitle, h2.section-subtitle, h3.section-subtitle,
 h4.section-subtitle, h5.section-subtitle, h6.section-subtitle {
     margin-top: 0.4em;
 }
 
 hr.docutils {
     width: 75%;
 }
 
 img.align-left {
     clear: left;
 }
 
 img.align-right {
     clear: right;
 }
 
 ol.simple, ul.simple {
     margin-bottom: 1em;
 }
 
 ol.arabic {
     list-style: decimal;
 }
 
 ol.loweralpha {
     list-style: lower-alpha;
 }
 
 ol.upperalpha {
     list-style: upper-alpha;
 }
 
 ol.lowerroman {
     list-style: lower-roman;
 }
 
 ol.upperroman {
     list-style: upper-roman;
 }
 
 p.attribution {
     text-align: right;
     margin-left: 50%;
 }
 
 p.caption {
     font-style: italic;
 }
 
 p.credits {
     font-style: italic;
     font-size: smaller;
 }
 
 p.label {
     white-space: nowrap;
 }
 
 p.rubric {
     font-weight: bold;
     font-size: larger;
     color: maroon;
     text-align: center;
 }
 
 pre.address {
     margin-bottom: 0;
     margin-top: 0;
     font-family: serif;
     font-size: 100%;
 }
 
 pre.literal-block, pre.doctest-block {
     margin-left: 2em;
     margin-right: 2em;
 }
 
 span.classifier {
     font-family: sans-serif;
     font-style: oblique;
 }
 
 span.classifier-delimiter {
     font-family: sans-serif;
     font-weight: bold;
 }
 
 span.interpreted {
     font-family: sans-serif;
 }
 
 span.option {
     white-space: nowrap;
 }
 
 span.pre {
     white-space: pre;
 }
 
 span.problematic {
     color: red;
 }
 
 span.section-subtitle {
     /* font-size relative to parent (h1..h6 element) */
     font-size: 80%;
 }
 
 table.citation {
     border-left: solid 1px gray;
     margin-left: 1px;
 }
 
 table.footnote {
     border-left: solid 1px black;
     margin-left: 1px;
 }
 
 h1 tt.docutils, h2 tt.docutils, h3 tt.docutils,
 h4 tt.docutils, h5 tt.docutils, h6 tt.docutils {
     font-size: 100%;
 }
 
 ul.auto-toc {
     list-style-type: none;
 }