diff --git a/content/options.xhtml b/content/options.xhtml
index ab43acf..6b7e0db 100644
--- a/content/options.xhtml
+++ b/content/options.xhtml
@@ -37,7 +37,7 @@
       <hbox align="baseline">
         <label control="fontpx_textbox" value="Font size of image, if not automatically set:" />
         <html:input preference="tblatex.font_px" id="fontpx_textbox"
-          type="number" min="1" decimalplaces="0" increment="1" size="2" />
+          type="number" min="1" step="1" style="width: 6em" />
         <label control="fontpx_textbox" value="px" />
       </hbox>
     </groupbox>