Change Font Styles for H4

Is there a way to add CSS to change the font style for only H4?  I'd like to use the style "Timberline", but I don't want all my headings to change to that style.  I'd also be okay with CSS that changes to Timberline when in italics.  I've tried searching the web for a solution but am having trouble finding something.  Thank you!

@alonna You first have to upload the font you mentioned on Squarespace and set it up with custom code so it can be used as an H4 font. You might find this tutorial helpful: How to Upload Custom Fonts on Squarespace.

@Lesum Thank you!  So there's no way to use fonts that are already integrated into Squarespace?  It requires uploading a font?

@alonna Unfortunately yes. 

@Lesum thank you so much, I appreciate it!

To apply Timberline font for Heading 4, you can use this code to Custom CSS box.

h4 {
	font-family: timberline !important;
}

To apply Timberline for Specific Heading 4, you can make Heading 4 Italic, then use this CSS code

h4 em {
	font-family: timberline !important;
	font-style: normal !important;
}

In the next case, to find font-family of a specific font, you can follow this approach