Adding a font

Hi i am trying to add a font but keep getting a Syntax Error On Line 1

am i doing it wrong the code is https://static1.squarespace.com/static/5f4f71b03fbc5771c7d75794/t/5f4f7f0c74b92128fd498cd2/1599045389192/Axis+Extrabold.otf

This is the resource I follow for uploading Custom Fonts: https://bigcatcreative.com/blog/upload-fonts-squarespace

You'll want to add the font file through Design > Custom CSS.