Hey @fdecludt thanks for posting!  Have you seen our Custom Font documentation yet? I’ll share it with you below: 

https://documentation.unbounce.com/hc/en-us/articles/360022023652-Using-Custom-Bespoke-Fonts-and-font-face-in-the-Classic-Builder 

There is a stylesheet in that doc that we provide for applying fonts to Headings:

Can you try using this instead as the base of your stylesheet to see if that helps? 

• Reset Styles: Ensure the design appears the same across all devices and browsers by starting with a clean slate.

• Body Styling: Set global properties for fonts, colors, and background to create a cohesive look.

• Container Design: Use a central layout to keep content well-structured and visually appealing.

• Header Styling: Make headers stand out with bold colors and centered text for a professional touch.

• Navigation Bar: Create a streamlined menu for easy navigation, ensuring options like "Vape Products" are prominently displayed.

• Button Design: Use eye-catching buttons to encourage user actions, such as "Shop Now" for vape products.

• Typography: Choose readable fonts and sizes for headings, subheadings, and paragraphs to maintain clarity.

• Image Placement: Optimize image layouts, such as vape product pictures, for both aesthetics and fast loading.

• Footer Styling: Include useful links like contact info or "Discover Vape Trends" in a neatly designed footer.

• Responsive Design: Ensure the style adapts to different devices, making vape websites user-friendly on mobile and desktop.

• Color Schemes: Pick a consistent palette that aligns with the theme, such as sleek tones for modern vape brands.

• User-Friendly Design: Prioritize ease of use, highlighting features like "Latest Vape Models" to grab attention.