diff --git a/src/main.rs b/src/main.rs
index af610b5..e3da23a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,10 +1,19 @@
+mod auth;
 mod tui;
 
-fn main() -> std::io::Result<()> {
+use std::io;
+
+fn main() -> io::Result<()> {
     let (username, password) = tui::run()?;
 
-    println!("user = {username}");
-    println!("pass = {password}");
+    match auth::authenticate(&username, &password) {
+        Ok(()) => {
+            println!("authentication successful");
+        }
+        Err(_) => {
+            println!("authentication failed");
+        }
+    }
 
     Ok(())
 }
diff --git a/src/tui.rs b/src/tui.rs
index d11ec6a..6580cfd 100644
--- a/src/tui.rs
+++ b/src/tui.rs
@@ -36,7 +36,7 @@ pub fn run() -> io::Result<(String, String)> {
             let user = Paragraph::new(username.as_str())
                 .block(Block::default().borders(Borders::ALL).title("User"))
                 .style(if focus == 0 {
-                    Style::new().fg(Color::from_u32(0x00235759))
+                    Style::new().fg(Color::from_u32(0x00_235759))
                 } else {
                     Style::default()
                 });
@@ -44,7 +44,7 @@ pub fn run() -> io::Result<(String, String)> {
             let pass = Paragraph::new(password.as_str())
                 .block(Block::default().borders(Borders::ALL).title("Password"))
                 .style(if focus == 1 {
-                    Style::new().fg(Color::from_u32(0x00235759))
+                    Style::new().fg(Color::from_u32(0x00_235759))
                 } else {
                     Style::default()
                 });
@@ -57,7 +57,12 @@ pub fn run() -> io::Result<(String, String)> {
             match key.code {
                 KeyCode::Esc => break,
                 KeyCode::Tab => focus = (focus + 1) % 2,
-                KeyCode::Enter => break,
+                KeyCode::Enter => {
+                    if !username.is_empty() && !password.is_empty() {
+                        break;
+                    }
+                }
+
                 KeyCode::Backspace => {
                     if focus == 0 {
                         username.pop();