Add mdvimb styles to configuration

'darkzen' color profile for HTMLs generated by mdvimb

dotfiles/bash/main.bashrc

@@ -496,6 +496,7 @@ export PRETTY=color
 export PRETTY_DEBUG_EXCLUDE=inigrep
 
 export MDVIMB__CONVERTER=commonmark
+export MDVIMB__STYLE=darkzen    # pergamen
 
 #shellcheck disable=SC2034
 {

dotfiles/config/mdvimb/css/darkzen.css

@@ -0,0 +1,31 @@
+body {
+    background-color: #111;
+    font-family: sans-serif;
+    padding: 2em 4em 2em 4em;
+    color: #ddd;
+}
+
+code {
+    color: #977;
+    background-color: #100;
+}
+
+pre {
+    padding: 1em ;
+    background-color: #100;
+}
+
+blockquote {
+    padding: 0.5em 1em 0.5em 1em;
+    border-left: solid 0.2em #8ae;
+    background-color: #112;
+}
+
+a:hover {
+    color: #cf8;
+}
+
+a {
+    color: #da8;
+}
+

dotfiles/config/mdvimb/css/pergamen.css

@@ -0,0 +1,30 @@
+body {
+    background-color: #ffc;
+    font-family: sans-serif;
+    padding: 2em 4em 2em 4em;
+}
+
+code {
+    color: #900;
+    background-color: #fec;
+}
+
+pre {
+    padding: 1em ;
+    background-color: #fec;
+}
+
+blockquote {
+    padding: 0.5em 1em 0.5em 1em;
+    border-left: solid 0.2em #99e;
+    background-color: #eef;
+}
+
+a {
+    color: #99e;
+}
+
+a:hover {
+    color: #77c;
+}
+