Merge pull request #1998 from weseek/support/change-code-font

modify $font-family-monospace

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

@@ -18,7 +18,7 @@ $dark: #3e4d6c !default;
 //## 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;
 
 $font-size-root: 14px;