style: change the margin-bottom as mb-4

Author: razonyang

layouts/partials/hb/modules/content-panel/index.html

@@ -1,5 +1,5 @@
 <div
-  class="hb-content-panel-wrapper position-sticky mb-3 d-flex justify-content-center">
+  class="hb-content-panel-wrapper position-sticky mb-4 d-flex justify-content-center">
   <div class="hb-content-panel d-flex shadow w-auto rounded-5 bg-body">
     {{ partial "hb/modules/content-panel/translations" . }}
     {{ partial "hb/modules/content-panel/comments" . }}