diff --git a/markdown2html.py b/markdown2html.py
index 0e89f42..07f38ac 100644
--- a/markdown2html.py
+++ b/markdown2html.py
@@ -86,7 +86,7 @@ def markdown2html(markdown, basepath, re_render, resources, viewport_width, font
 
     # FIXME: report that ST doesn't support <br/> but does work with <br />... WTF?
     # Add font scaling CSS rule
-    font_scale_css = "html {{ font-size: {}em; }}\n".format(font_scale)
+    font_scale_css = "body {{ transform: scale({}); transform-origin: top left; }}\n".format(font_scale)
     stylesheet = font_scale_css + resources["stylesheet"]
 
     return "<style>\n{}\n</style>\n\n{}".format(stylesheet, soup).replace(