Usage
theme_title(fig, pars = NULL, background_fill_color = "white",
background_fill_alpha = 1, border_fill_color = "white",
border_fill_alpha = 1, text_align = "left", text_alpha = 1,
text_baseline = "bottom", text_color = "#444444",
text_font = "Helvetica", text_font_size = "12pt",
text_font_style = "normal")