Code showing in wordpress post titles around website

Maybe the easiest way is to add some custom css

i {font-style:italic; }

If needed, you could add the ‘important’:

i {font-style:italic !important; }

If your theme supports ‘extra/custom css’, put that in there. Or, create a child theme and put it in that child theme’s style.css .

Not recommended to put it in the theme’s style.css file, as a theme update would overwrite your change.