diff --git a/src/app/mod.rs b/src/app/mod.rs
index bea0424..f195007 100644
--- a/src/app/mod.rs
+++ b/src/app/mod.rs
@@ -3,7 +3,8 @@ mod ui;
 /// Stuct to store the state of the running application
 pub struct App {
     name: String,
-    ip: String
+    ip: String,
+    cidr: String
 }
 
 impl Default for App {
@@ -11,7 +12,8 @@ impl Default for App {
     fn default() -> Self {
         Self {
             name: String::from("Hello, World!"),
-            ip: String::from("127.0.0.1")
+            ip: String::from("127.0.0.1"),
+            cidr: String::from("24")
         }
     }
 }
diff --git a/src/app/ui/mod.rs b/src/app/ui/mod.rs
index be65355..434f7dc 100644
--- a/src/app/ui/mod.rs
+++ b/src/app/ui/mod.rs
@@ -3,7 +3,7 @@ use std::str::FromStr;
 use crate::app::App;
 use crate::theme::onedark::ONE_DARK;
 
-use subnet_calculator::{Network, ip::IpAddr};
+use subnet_calculator::{Network, ip::IpAddr, NetworkingErr};
 
 impl eframe::App for App {
     fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
@@ -11,23 +11,24 @@ impl eframe::App for App {
         
         egui::CentralPanel::default()
         .frame(background_frame)
-        .show(ctx, |ui| {
-            ui.heading(&self.name);
-        });
-
-        egui::Window::new("test window")
-            .collapsible(false)
-            .auto_sized()
-            .show(ctx, |ui| {
+        .show(ctx, |_| {
+            egui::SidePanel::left("my_panel").show(ctx, |ui| {
                 ui.heading(&self.name);
-                
-                ui.text_edit_singleline(&mut self.ip);
-                Network::create_subnet(&IpAddr::from_str(self.ip.as_str()).unwrap(), 24).unwrap();
+            });
 
-                for _ in 0..10 {
-                    ui.add(egui::Button::new(&self.name));
+            egui::CentralPanel::default().show(ctx, |ui| -> Result<(), NetworkingErr>{
+                ui.heading(&self.name);
+                ui.text_edit_singleline(&mut self.ip);
+                ui.text_edit_singleline(&mut self.cidr);
+
+                if ui.button(String::from("Calculate Subnet")).clicked() {
+                    let ip_addr: IpAddr = IpAddr::from_str(self.ip.as_str())?;
+                    let cidr: u8 = u8::from_str(self.cidr.as_str()).unwrap_or(24);
+                    println!("{:?}", Network::create_subnet(&ip_addr, cidr)?);
                 }
-            }
-        );
+
+                Ok(())
+            });
+        });
     }
 }