let fontStyle = document.body;
	if (fontStyle.style.fontFamily == 'Ubuntu') {
        fontStyle.style.fontFamily ='Indie Flower';
    }else if (fontStyle.style.fontFamily == 'Indie Flower'){
        fontStyle.style.fontFamily == 'Abel';
    }
	else if (fontStyle.style.fontFamily == 'Abel'){
        fontStyle.style.fontFamily == 'Ubuntu';
	}