diff --git a/Cargo.toml b/Cargo.toml
index b8e8ae4..48e4aa6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,10 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-eframe = { version = "*" }
+egui = { version = "0.33.3" }
+eframe = { version = "0.33.3" }
+log = "0.4.28"
+colog = "1.4.0"
 rfd = "*"
 json = "*"
 serde = { version = "*", features = ["derive"] }
diff --git a/src/main.rs b/src/main.rs
index a64ee48..0c905d7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,10 +2,12 @@ use std::path::PathBuf;
 
 use eframe::egui;
 use eframe::egui::KeyboardShortcut;
+use log::{info, warn, error};
 
 use billy_sheet::gui::SheetGui;
 
 fn main() -> eframe::Result {
+    colog::init();
     let options = eframe::NativeOptions {
         viewport: egui::ViewportBuilder::default().with_drag_and_drop(true),
         ..Default::default()
@@ -36,8 +38,8 @@ impl Default for Gui {
 impl eframe::App for Gui {
     fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
         egui::TopBottomPanel::top("menu").show(ctx, |ui| {
-            egui::menu::bar(ui, |ui| {
-                egui::widgets::global_dark_light_mode_buttons(ui);
+            egui::MenuBar::new().ui(ui,  |ui| {
+                egui::widgets::global_theme_preference_buttons(ui);
                 ui.menu_button("File", |ui| {
                     if ui.button("Open (Ctrl + O)").clicked() {
                         if let Some(path) = rfd::FileDialog::new()
@@ -54,7 +56,7 @@ impl eframe::App for Gui {
                     if ui.button("Save in json").clicked() {
                         let path = std::path::Path::new("./sheet.json");
                         if let Err(error) = billy_sheet::sheet::write_sheet(path, &self.sheet) {
-                            println!("{error}");
+                            error!("{error}");
                         }
                     }
                 });
@@ -99,7 +101,19 @@ impl eframe::App for Gui {
             }
         });
         if let Some(file_path) = &self.picked_path {
-            println!("{}", file_path.to_str().unwrap_or_default());
+            if let Some(extension) = file_path.extension() {
+                info!("File selected : {}", file_path.display());
+                if extension == "json" {
+                    info!("File has json extension");
+                } else {
+                    warn!(
+                        "File has not .json: {}",
+                        extension.to_str().unwrap_or_default()
+                    );
+                }
+            } else {
+                error!("No extension for the file.");
+            }
             self.picked_path = None;
         }
     }
diff --git a/src/sheet.rs b/src/sheet.rs
index 0021891..ac177f8 100644
--- a/src/sheet.rs
+++ b/src/sheet.rs
@@ -40,7 +40,7 @@ pub struct CharacterSheet {
 pub fn write_sheet(path: &std::path::Path, sheet: &CharacterSheet) -> std::io::Result<()> {
     let sheet_str = serde_json::to_string_pretty(&sheet)?;
     let mut file = std::fs::File::create(path)?;
-    write!(file, "{}", sheet_str)
+    write!(file, "{sheet_str}")
 }
 
 impl CharacterSheet {