diff --git a/src/pyj/book_list/book_details.pyj b/src/pyj/book_list/book_details.pyj
index d5009b405b..f42802c4fc 100644
--- a/src/pyj/book_list/book_details.pyj
+++ b/src/pyj/book_list/book_details.pyj
@@ -74,7 +74,7 @@ def on_fmt_click(ev):
 
         parent.appendChild(E.div(
             E.div(_('What would you like to do with the {} format?').format(fmt)),
-            E.div(style='margin:1ex auto; overflow: hidden; padding: 1em 1.5em; text-align: center',
+            E.div(class_='button-box',
                 create_button(_('Read {}').format(fmt), 'book', action.bind(None, read_format)),
                 '\xa0',
                 create_button(_('Download {}').format(fmt), 'cloud-download', action.bind(None, download_format)),
diff --git a/src/pyj/dom.pyj b/src/pyj/dom.pyj
index e05b311b0f..a40671fe51 100644
--- a/src/pyj/dom.pyj
+++ b/src/pyj/dom.pyj
@@ -13,6 +13,7 @@ simple_vendor_prefixes = {
     'animation-fill-mode': v"['webkit', 'moz', 'o']",
     'animation-play-state': v"['webkit', 'moz', 'o']",
     'transform': v"['webkit', 'ms', 'moz', 'o']",
+    'transform-origin': v"['webkit', 'ms', 'moz', 'o']",
     'transition': v"['webkit', 'moz', 'o']",
     'filter': v"['webkit']",
     'user-select': v"['webkit', 'moz', 'ms']",
diff --git a/src/pyj/modals.pyj b/src/pyj/modals.pyj
index f1fe730761..fa8033ec5b 100644
--- a/src/pyj/modals.pyj
+++ b/src/pyj/modals.pyj
@@ -21,6 +21,10 @@ add_extra_css(def():
     style += build_rule(
         '#modal-container a.dialog-simple-link:hover', color='red !important'
     )
+    style += build_rule(
+        '.button-box', display='flex', justify_content='flex-end', padding='1rem 0rem', overflow='hidden'
+    )
+    style += build_rule('.button-box .calibre-push-button', transform_origin='right')
     return style
 )