I am new to FF so please bare with me. 
I have created a form and I've been using "Views" to customise the output PDF. 

I have defined the Font styles in Views to use the same custom fonts within the website, but when it comes to people being able to "Download PDF" the fonts are system fonts. 
How do I stop this and keep them as the website fonts I used in Views?
I am no expert in CSS so any assistance would be HUGELY appreciated.
Thanks