add missing font

conf.py

@@ -102,6 +102,7 @@ latex_elements = {
         \usepackage{transparent}
         \usepackage{eso-pic}
         \usepackage{lipsum}
+	\usepackage{lmodern}
         \usepackage{footnotebackref} %% link at the footnote to go to the place of footnote in the text
         %% spacing between line
         \usepackage{setspace}
@@ -297,4 +298,4 @@ myst_html_meta = {
     "description lang=fr": "description des métadonnées",
     "keywords": "Sphinx, MyST",
     "property=og:locale":  "en_US"
-}
+}