Fix table row headers on scroll with {% rowheaders %} (#48676)

Author: gracepark

Diff for: src/frame/components/ui/MarkdownContent/stylesheets/table.scss

@@ -36,6 +36,12 @@
 
     thead tr {
       border: none;
+
+      th {
+        @include breakpoint-xxl {
+          top: 65px !important; // 48 + 8 + 8 + 1
+        }
+      }
     }
 
     th {
@@ -48,10 +54,6 @@
       box-shadow: 0 3px 0 0 var(--color-canvas-subtle);
       padding: 0.75rem 0.5rem;
       border: 0;
-
-      @include breakpoint-xxl {
-        top: 65px !important; // 48 + 8 + 8 + 1
-      }
     }
 
     th[align="center"] {