diff --git a/src/pyj/book_list/book_details.pyj b/src/pyj/book_list/book_details.pyj
index 47313c735b..915465df0e 100644
--- a/src/pyj/book_list/book_details.pyj
+++ b/src/pyj/book_list/book_details.pyj
@@ -110,7 +110,8 @@ def adjust_all_iframes(ev):
 window.addEventListener('resize', debounce(adjust_all_iframes, 250))
 
 def adjusting_sandboxed_html(html):
-    ans = sandboxed_html(html, 'html, body { overflow: hidden }', 'allow-same-origin')
+    css =  'html, body {{ overflow: hidden; color: {} }}'.format(get_color('window-foreground'))
+    ans = sandboxed_html(html, css, 'allow-same-origin')
     ans.addEventListener('load', def(ev): adjust_iframe_height(ev.target);)
     ans.style.height = '50vh'
     ans.dataset.last_window_width = '0'