modify $font-family-monospace

src/client/styles/scss/_override-bootstrap-variables.scss

@@ -26,7 +26,7 @@ $brand-danger:          $danger;
 //## Font, line-height, and color for body text, headings, and more.
 $font-family-sans-serif:  Lato, -apple-system, BlinkMacSystemFont, 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
 $font-family-serif:       Georgia, "Times New Roman", Times, serif;
-$font-family-monospace:   Osaka-Mono, "MS Gothic", Monaco, Menlo, Consolas, "Courier New", monospace;
+$font-family-monospace:   SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;
 $font-family-base:        $font-family-sans-serif;