Change the line in your custom CSS that says:

@font-face { font-family: porky; src: url(/api/util/ext/image?img=https://file.garden/ZjA6N6P0bFK6ND0Y/Jua-Regular.ttf); }

To:

@font-face { font-family: porky; src: url(https://file.garden/ZjA6N6P0bFK6ND0Y/Jua-Regular.ttf); }