how to delete delete @font-face element in source code

Site marceauverdiere.com weirdly flashing a source code element. And on mobile devices it’s always there. I just want to delete it but I don’t see it in any of the php or css files in wordpress theme editor. Any advice? This is what I want to delete:

@font-face {
font-family: ‘salarymanregular’;
src: url(‘salaryma-webfont.woff2’) format(‘woff2’),
url(‘salaryma-webfont.woff’) format(‘woff’);
font-weight: normal;
font-style: normal;

}