diff --git a/flake.nix b/flake.nix
index d37cbd5..a7a47ea 100644
--- a/flake.nix
+++ b/flake.nix
@@ -89,10 +89,11 @@
       {
         packages.default = crate;
 
-        packages.server-only = craneLib.buildPackage {
-          name = name + "-server-only";
+        packages."${name}-server-only" = craneLib.buildPackage {
+          name = "${name}-server-only";
           src = ./.;
-          cargoExtraArgs = "--no-default-features";
+          doCheck = false;
+          cargoExtraArgs = "--locked --no-default-features";
         };
 
         checks = {
diff --git a/src/app/graph.rs b/src/app/graph.rs
index 5b93a80..5dea431 100644
--- a/src/app/graph.rs
+++ b/src/app/graph.rs
@@ -6,12 +6,22 @@ use crate::app;
 
 const CYAN: Color = Color::from_rgb8(0, 255, 255);
 
-#[derive(Default)]
 pub struct Graph {
     timeline: VecDeque<f32>,
 
+    pub show_borders: bool,
     pub cache: canvas::Cache,
 }
+impl Default for Graph {
+    fn default() -> Self {
+        Self {
+            show_borders: true,
+
+            timeline: Default::default(),
+            cache: Default::default(),
+        }
+    }
+}
 
 impl Graph {
     pub fn new(value: f32) -> Self {
@@ -46,16 +56,19 @@ impl canvas::Program<app::Message, Theme, Renderer> for Graph {
         _cursor: mouse::Cursor,
     ) -> Vec<canvas::Geometry<Renderer>> {
         let geometry = self.cache.draw(renderer, bounds.size(), |frame| {
-            frame.stroke_rectangle(
-                Point::new(0., 0.),
-                bounds.size(),
-                canvas::Stroke::default().with_color(Color::from_rgb8(255, 0, 0)),
-            );
+            if self.show_borders {
+                frame.stroke_rectangle(
+                    Point::new(0., 0.),
+                    bounds.size(),
+                    canvas::Stroke::default().with_color(Color::from_rgb8(255, 0, 0)),
+                );
+            }
             frame.stroke(
                 &canvas::Path::new(|builder| {
                     for (index, value) in self.timeline.iter().enumerate() {
                         let x = index as f32 / self.timeline.len() as f32 * bounds.width;
-                        let y = bounds.height - value / 100. * bounds.height - 1.;
+                        let y = (bounds.height - value / 100. * bounds.height)
+                            .clamp(1., bounds.height - 1.);
                         builder.line_to(Point::new(x, y))
                     }
                 }),
diff --git a/src/app/mod.rs b/src/app/mod.rs
index 34d2e37..c46d289 100644
--- a/src/app/mod.rs
+++ b/src/app/mod.rs
@@ -53,9 +53,18 @@ impl State {
     }
     fn update(&mut self, message: Message) -> Task<Message> {
         match message {
-            Message::ToggleMain => self.is_main_section_shown.toggle(),
-            Message::ToggleCpu => self.is_cpu_section_shown.toggle(),
-            Message::ToggleMemory => self.is_memory_section_shown.toggle(),
+            Message::ToggleMain => {
+                self.is_main_section_shown.toggle();
+                self.check_borders();
+            }
+            Message::ToggleCpu => {
+                self.is_cpu_section_shown.toggle();
+                self.check_borders();
+            }
+            Message::ToggleMemory => {
+                self.is_memory_section_shown.toggle();
+                self.check_borders();
+            }
 
             Message::Info(snapshot) => {
                 self.uptime = snapshot.uptime();
@@ -75,10 +84,10 @@ impl State {
                         .map(|value| Graph::new(value))
                         .collect();
                 } else {
-                    for (graph, value) in self.cpu_graphs.iter_mut().zip(snapshot.cpus.into_iter())
-                    {
-                        graph.update(value);
-                    }
+                    self.cpu_graphs
+                        .iter_mut()
+                        .zip(snapshot.cpus.into_iter())
+                        .for_each(|(graph, value)| graph.update(value));
                 }
             }
         }
@@ -140,6 +149,11 @@ impl State {
     fn title(&self) -> String {
         format!("itop {:?}", self.uptime)
     }
+
+    fn check_borders(&mut self) {
+        self.total_cpu_graph.show_borders =
+            self.is_cpu_section_shown || self.is_memory_section_shown;
+    }
 }
 
 pub fn run() -> Result<(), Error> {