--- a/eric6/QScintilla/Exporters/ExporterHTML.py	Mon Jan 04 15:59:40 2021 +0100
+++ b/eric6/QScintilla/Exporters/ExporterHTML.py	Mon Jan 04 16:39:09 2021 +0100
@@ -174,7 +174,8 @@
                             font = lex.font(subs_start + subs_idx)
                             colour = lex.color(subs_start + subs_idx)
                             paper = lex.paper(subs_start + subs_idx)
-                            html += '.S{0:d} {{\n'.format(subs_idx - subs_start)
+                            html += '.S{0:d} {{\n'.format(
+                                subs_idx - subs_start)
                             if font.italic():
                                 html += '    font-style: italic;\n'
                             if font.bold():