Help with the font size of the post titles

Good Day Guys,

Can i ask some assistance,
Is there a way for me to change the font size of my post titles since adding this

.post-title {
font-size: 22px !important;
}

on my theme editor doesnt seem to work ? and I’m unable to get in touch with theme creator

Thank you

The page I need help with: [log in to see the link]



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