docs: small documentation update (restructured FAQ about boost libraries)
diff --git a/docs/ns3_html_theme/static/ns3_stylesheet.css b/docs/ns3_html_theme/static/ns3_stylesheet.css
index 341b70a..c900197 100644
--- a/docs/ns3_html_theme/static/ns3_stylesheet.css
+++ b/docs/ns3_html_theme/static/ns3_stylesheet.css
@@ -124,3 +124,8 @@
 .highlight .hll {
 	background-color: #FFFF88;
 }
+
+.red {
+    color: red;
+    font-weight: bold;
+}
\ No newline at end of file