Change site-wide banner text (Bedford)

Site URL: https://www.katieparker.com.au/

I am trying to change the banner font used to a custom font (which I have successfully loaded to CSS)

Add to Home > Design > Custom CSS

@font-face {
	font-family: tuanphan;
	src: url(paste font file url here);
}
.desc-wrapper * {
    font-family: tuanphan !important;
}

Thanks so much!