Ignore style modifiers and underline for now

src/theme.rs

@@ -301,6 +301,8 @@ impl Palette {
             match name.as_str() {
                 "fg" => style.fg = Some(self.parse_color(&value)?),
                 "bg" => style.bg = Some(self.parse_color(&value)?),
+                "modifiers" => {} // ignore for now
+                "underline" => {} // ignore for now
                 _ => return Err(format!("Theme: invalid style attribute: {}", name)),
             }
         }