diff --git a/src/pyj/read_book/view.pyj b/src/pyj/read_book/view.pyj
index 3ec5668696..4c8d53164e 100644
--- a/src/pyj/read_book/view.pyj
+++ b/src/pyj/read_book/view.pyj
@@ -205,7 +205,11 @@ class View:
             sandbox += '  allow-same-origin'
         container.appendChild(
             E.div(style='max-height: 100vh; width: 100vw; height: 100vh; overflow: hidden; display: flex; align-items: stretch',  # container for horizontally aligned panels
-                  E.div(style='max-height: 100vh; display: flex; flex-direction: column; align-items: stretch; flex-grow:2',  # container for iframe and any other panels in the same column
+                oncontextmenu=def (ev):
+                    ev.preventDefault()
+                ,
+
+                E.div(style='max-height: 100vh; display: flex; flex-direction: column; align-items: stretch; flex-grow:2',  # container for iframe and any other panels in the same column
                     E.div(style='max-height: 100vh; flex-grow: 2; display:flex; align-items: stretch',  # container for iframe and its overlay
                         left_margin,
                         E.div(style='flex-grow:2; display:flex; align-items:stretch; flex-direction: column', # container for top and bottom margins