Fix broken fonts in light theme

src/app.rs

@@ -15,7 +15,7 @@ use crate::{
 };
 use egui::{
     Align, Button, Context, FontData, FontDefinitions, FontId, Image, Key, Modifiers,
-    PointerButton, RichText, ScrollArea, Widget, include_image,
+    PointerButton, RichText, ScrollArea, Theme, Widget, include_image,
 };
 use eyre::eyre;
 
@@ -202,7 +202,8 @@ impl App {
         cc.egui_ctx.set_fonts(fonts);
 
         // markdown font styles
-        cc.egui_ctx.style_mut(|style| {
+        for theme in [Theme::Dark, Theme::Light] {
+            cc.egui_ctx.style_mut_of(theme, |style| {
                 for (name, size) in [
                     ("H1", 28.0),
                     ("H2", 26.0),
@@ -220,6 +221,7 @@ impl App {
                     );
                 }
             });
+        }
 
         // enable features on egui_extras to add more image types
         egui_extras::install_image_loaders(&cc.egui_ctx);