How to set the font-family as specified when editing post in wordpress?

I have created a child themes, set font-family as my desired DejaVu Sans Mono for every html element.

    vim /var/www/html/wp-content/themes/twentyfourteen-child/style.css
    *{
        font-family:"DejaVu Sans Mono" !important;
    }

I use twentyfourteen-child as my wordpress theme.
Every character in edit status is not DejaVu Sans Mono.
not DejaVu Sans Mono

Every character in post is DejaVu Sans Mono after published.
DejaVu Sans Mono

How can i set the font-family as DejaVu Sans Mono when editing post?

• This topic was modified 6 years, 1 month ago by elearn2014.
• This topic was modified 6 years, 1 month ago by elearn2014.