Hello, @Kstb1979,
Please copy and paste the below-given CSS code to XStore >> Theme Settings >> Theme Custom CSS >> Global CSS and change the font-family in the given code as per your requirements.
.single-product .ctc_chat.ctc_woo_place p.ctc_s_7_1_cta.ctc-analytics.ctc_cta.ht-ctc-cta {
font-family: Oswald, sans-serif !important;
}
Regards 8Themes Team.