diff --git a/public/abpm-report-template.html b/public/abpm-report-template.html
index 3c5d481..eb35b95 100644
--- a/public/abpm-report-template.html
+++ b/public/abpm-report-template.html
@@ -2394,10 +2394,12 @@
         function showLoading() {
             const mask = document.getElementById('loading-mask');
             if (mask) mask.style.display = 'flex';
+            document.body.style.overflow = 'hidden';
         }
         function hideLoading() {
             const mask = document.getElementById('loading-mask');
             if (mask) mask.style.display = 'none';
+            document.body.style.overflow = '';
         }
     </script>
 </body>