How to set one white space as width as one character in wordpress?

My wp theme is twentyfifteen ,font in style.css is inherit,the font in firefox is noto mono. I found that one white space is as width as one character in wordpress development--this forum,two white spaces is as width as one character in my wordpress.

How to set one white space as width as one character in wordpress?

Topic content-width pre Wordpress

Category Web

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