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+Style guide
+===========
+
+
+Key principle
+-------------
+
+Highlight.js themes are language agnostic.
+
+Instead of trying to make a *rich* set of highlightable classes look good in a
+handful of languages we have a *limited* set of classes that work for all
+languages.
+
+Hence, there are two important implications:
+
+* Highlight.js styles tend to be minimalistic.
+* It's not possible to exactly emulate themes from other highlighting engines.
+
+
+Defining a theme
+----------------
+
+A theme is a single CSS defining styles for class names listed in the
+:doc:`class reference </css-classes-reference>`. The general guideline is to
+style all available classes, however an author may deliberately choose to
+exclude some (for example, ``.attr`` is usually left unstyled).
+
+You are not required to invent a separate styling for every group of class
+names, it's perfectly okay to group them:
+
+::
+
+  .hljs-string,
+  .hljs-section,
+  .hljs-selector-class,
+  .hljs-template-variable,
+  .hljs-deletion {
+    color: #800;
+  }
+
+Use as few or as many unique style combinations as you want.
+
+
+Typography and layout dos and don'ts
+------------------------------------
+
+Don't use:
+
+* non-standard borders/margin/paddings for the root container ``.hljs``
+* specific font faces
+* font size, line height and anything that affects position and size of
+  characters within the container
+
+Okay to use:
+
+* colors (obviously!)
+* italic, bold, underlining, etc.
+* image backgrounds
+
+These may seem arbitrary at first but it's what has shown to make sense in
+practice.
+
+There's also a common set of rules that *has* to be defined for the root
+container verbatim:
+
+::
+
+  .hljs {
+    display: block;
+    overflow-x: auto;
+    padding: 0.5em;
+  }
+
+
+``.subst``
+----------
+
+One important caveat: don't forget to style ``.subst``. It's used for parsed
+sections within strings and almost always should be reset to the default color:
+
+::
+
+  .hljs,
+  .hljs-subst {
+    color: black;
+  }
+
+
+Contributing
+------------
+
+You should include a comment at the top of the CSS file with attribution and
+other meta data if necessary. The format is free:
+
+::
+
+  /*
+
+  Fancy style (c) John Smith <email@domain.com>
+
+  */
+
+If you're a new contributor add yourself to the authors list in AUTHORS.*.txt
+(use either English and/or Russian version). Also update CHANGES.md with your
+contribution.
+
+Send your contribution as a pull request on GitHub.