pre styling for code in docs

Author: tony

doc/_static/libtmux.css

@@ -7,3 +7,22 @@ div#changelog > div.section > ul > li > p:only-child {
         display: none;
     }
 }
+
+table.docutils {
+   background-color: #fafbfc;
+   border: 0;
+}
+
+table.docutils td, table.docutils th {
+   border: 0;
+}
+
+table.docutils pre {
+  background-color: rgba(239, 242, 244, .75);
+}
+
+pre {
+  background-color: #fafbfc;
+  border-left: 5px solid #558abb;
+  font-size: 0.75em;
+}