custom.css: Prevent overlaps with top bar and anchors

Closes T1264

docs/_static/custom.css

@@ -59,3 +59,11 @@ a {
     padding-right: 3px;
     padding-bottom: 3px;
 }
+
+/* Prevent overlaps with top bar and anchors */
+:target::before {
+    content: "";
+    display: block;
+    height: 30px;
+    margin: -30px 0 0;
+}

[Phabricator Migration user]

Some references in the commit message have been migrated:

• T1264 is now #1264 (closed)