diff --git a/src/fenigma/app.py b/src/fenigma/app.py
index bcd7232..d13db6c 100644
--- a/src/fenigma/app.py
+++ b/src/fenigma/app.py
@@ -277,6 +277,10 @@ class MainWindow(Adw.ApplicationWindow):
         self.cursor_label = Gtk.Label(xalign=1)
         self.cursor_label.add_css_class("dim-label")
         self.cursor_label.add_css_class("numeric")
+        # Monospace so the constantly-changing digits (azimuth/distance/
+        # coord under the cursor) don't jitter the label's width on every
+        # mouse-move redraw the way a proportional font would.
+        self.cursor_label.add_css_class("monospace")
         header.pack_end(self.cursor_label)  # packed after firing_btn -> sits to its left
 
         self.canvas = GridCanvas(self.board)
diff --git a/src/fenigma/firing_panel.py b/src/fenigma/firing_panel.py
index 0734961..227d5f0 100644
--- a/src/fenigma/firing_panel.py
+++ b/src/fenigma/firing_panel.py
@@ -64,8 +64,8 @@ def _ensure_charge_segment_css() -> None:
     provider = Gtk.CssProvider()
     provider.load_from_string(f"""
         button.{_CHARGE_SEG_CSS_CLASS} {{
-            min-width: 20px;
-            min-height: 20px;
+            min-width: 28px;
+            min-height: 28px;
             padding: 0;
             border-radius: 9999px;
         }}