add nnfx theme (#2571)

AUTHORS.txt

@@ -286,3 +286,4 @@ Contributors:
 - G8t Guy <g8tguy@g8tguy.com>
 - Samia Ali <samiaab1990@gmail.com>
 - Alexandre Grison <a.grison@gmail.com>
+- Jim Mason <jmason@ibinx.com>

CHANGES.md

@@ -1,5 +1,9 @@
 ## Version 10.1.0 (in progress)
 
+New themes:
+
+- *NNFX* by [Jim Mason][]
+
 Parser Engine:
 
 - (parser) Now escapes quotes in text content when escaping HTML (#2564) [Josh Goebel][]
@@ -53,6 +57,7 @@ Language Improvements:
 [Sergey Prokhorov]: https://github.com/seriyps
 [Nils Knappmeier]: https://github.com/nknapp
 [Martin (Lhoerion)]: https://github.com/Lhoerion
+[Jim Mason]: https://github.com/RocketMan
 
 
 ## Version 10.0.2

src/styles/nnfx.css

@@ -0,0 +1,106 @@
+/**
+ * nnfx - a theme inspired by Netscape Navigator/Firefox
+ *
+ * @version 1.0.0
+ * @author (c) 2020 Jim Mason <jmason@ibinx.com>
+ * @license https://creativecommons.org/licenses/by-sa/4.0  CC BY-SA 4.0
+ */
+
+.hljs {
+  display: block;
+  overflow-x: auto;
+  padding: 0.5em;
+  background: #fff;
+  color: #000;
+}
+
+.xml .hljs-meta {
+  font-weight: bold;
+  font-style: italic;
+  color: #48b;
+}
+
+.hljs-comment,
+.hljs-quote {
+  font-style: italic;
+  color: #070;
+}
+
+.hljs-name,
+.hljs-keyword {
+  color: #808;
+}
+
+.hljs-name,
+.hljs-attr {
+  font-weight: bold;
+}
+
+.hljs-string {
+  font-weight: normal;
+}
+
+.hljs-variable,
+.hljs-template-variable {
+  color: #477;
+}
+
+.hljs-code,
+.hljs-string,
+.hljs-meta-string,
+.hljs-number,
+.hljs-regexp,
+.hljs-link {
+  color: #00f;
+}
+
+.hljs-title,
+.hljs-symbol,
+.hljs-bullet,
+.hljs-built_in,
+.hljs-builtin-name {
+  color: #f40;
+}
+
+.hljs-section,
+.hljs-meta {
+  color: #642;
+}
+
+.hljs-class .hljs-title,
+.hljs-type {
+  color: #639;
+}
+
+.hljs-function .hljs-title,
+.hljs-attr,
+.hljs-subst {
+  color: #000;
+}
+
+.hljs-formula {
+  background-color: #eee;
+  font-style: italic;
+}
+
+.hljs-addition {
+  background-color: #beb;
+}
+
+.hljs-deletion {
+  background-color: #fbb;
+}
+
+.hljs-selector-id,
+.hljs-selector-class {
+  color: #964;
+}
+
+.hljs-doctag,
+.hljs-strong {
+  font-weight: bold;
+}
+
+.hljs-emphasis {
+  font-style: italic;
+}