diff --git a/src/main.rs b/src/main.rs
index 0a597e7..16f16b7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -96,8 +96,8 @@ fn main() -> Result<(), Box<dyn Error>> {
     // Parse data
     let toml_data = fs::read_to_string("data.toml").expect("Failed to read data file.");
     let data: Data = toml::from_str(&toml_data).expect("Failed to parse TOML data");
-    let max_temp = data.max_temp() + 1.0;
-    let min_temp = data.min_temp() - 1.0;
+    let max_temp = f64::ceil((data.max_temp() + 1.0) / 5.0) * 5.0;
+    let min_temp = f64::floor((data.min_temp() - 1.0) / 5.0) * 5.0;
     let num_temps = data.len();
 
     // Chart data
@@ -125,6 +125,7 @@ fn main() -> Result<(), Box<dyn Error>> {
         .y_desc("Temps (C)")
         .draw()?;
 
+    // CPU temp sensors
     data.temps.iter().for_each(|temps| {
         let color = line_colors.next();
         chart
@@ -186,13 +187,42 @@ fn main() -> Result<(), Box<dyn Error>> {
             _ => {}
         });
 
+    // Test dividers
+    data.tests
+        .iter()
+        .filter(|test| test.name != "Idle")
+        .for_each(|test| {
+            let color = match test.name.as_str() {
+                "Cooldown" => RGBAColor(0, 0, 255, 1.0),
+                "Prime95" => RGBAColor(255, 0, 0, 1.0),
+                "Sysbench" => RGBAColor(255, 165, 0, 1.0),
+                _ => line_colors.next().to_rgba(),
+            };
+            test.offsets.iter().for_each(|offset| {
+                let offset = *offset as i32;
+                chart
+                    .draw_series(DashedLineSeries::new(
+                        [(offset, min_temp + 1.0), (offset, max_temp - 1.0)],
+                        10,
+                        5,
+                        ShapeStyle {
+                            color,
+                            filled: false,
+                            stroke_width: 1,
+                        },
+                    ))
+                    .unwrap();
+            });
+        });
+
+    // Export to file
     chart
         .configure_series_labels()
         .position(SeriesLabelPosition::LowerRight)
         .margin(20)
         .legend_area_size(5)
         .border_style(BLACK)
-        .background_style(BLACK.mix(0.1))
+        .background_style(RGBColor(192, 192, 192))
         .label_font(("Calibri", 20))
         .draw()?;