AO3-6622 Decrease margins on definition lists in FAQs (#4756)

* adjusted margins for faq related dd and dl elements

* reverted borked spacing

* move forgotten rule down into context

* move selectors all to one line

* indented css3 rules

* missed some

* fixed spacing on css3 rule

* added a new spec

* removed accidental test!

public/stylesheets/site/2.0/21-userstuff.css

@@ -122,8 +122,8 @@
 .userstuff caption {
   font-size: 1em;
   height: auto;
-  opacity: 1.0;
   width: auto;
+    opacity: 1;
 }
 
 .userstuff table, .userstuff td, .userstuff col, .userstuff tr, .userstuff thead, .userstuff tfoot, .userstuff tbody, .userstuff th, .userstuff thead td, .userstuff th a, .userstuff th a:link {
@@ -183,11 +183,21 @@
 /* contexts */
 
 .bookmark .user .userstuff {
-	line-height: 1.5;
+  line-height: 1.5;
 }
 
 .bookmark .user .userstuff blockquote {
-	margin-bottom: 1.286em;
+  margin-bottom: 1.286em;
+}
+
+.faq .userstuff dd {
+  margin-block-start: 0.75em;
+  margin-block-end: 0.75em;
+  margin-inline-start: 1.75em;
+}
+
+.faq .userstuff dl {
+  margin: 0.75em 0;
 }
 
 /*END== */