Use a custom font on my form in Mojave

How can I apply a custom font I uploaded to squarespace to my form?

@font-face {
 font-family: yourFont;
 src: url(sansation_light.woff);
}
.your-form-class-name {
 font-family: yourFont !important;
}

Thanks! I ended up just using a font through Adobe TypeKit so I just changed the font using the Style Editor. Another question though, I can change the font of the button, but do you know how to make the button font smaller? There seems to be no option for that.

Thanks!

@zande88 CSS font-size: 10px !important;

Need site url to provide exactly css

https://www.modernesh.com/contact

@zande88

.form-button-wrapper .button {
   font-size: 10px !important;
}

Perfect! I really appreciate all of your help! :)