fix(ui): improve margins consistency wrt. header/footer

internal/ui/static/css/common.css

@@ -145,7 +145,7 @@ a:hover {
 /* Page header and footer*/
 .page-header {
     padding-inline: 3px;
-    margin-bottom: 25px;
+    margin-bottom: 10px;
 }
 
 .page-footer {