diff --git a/apps/ltn/src/common/mod.rs b/apps/ltn/src/common/mod.rs
index 4dea7604a0..f8e71362a7 100644
--- a/apps/ltn/src/common/mod.rs
+++ b/apps/ltn/src/common/mod.rs
@@ -1,25 +1,34 @@
+use geom::CornerRadii;
 use widgetry::{
-    lctrl, EventCtx, HorizontalAlignment, Key, Line, Outcome, Panel, PanelBuilder, PanelDims,
-    VerticalAlignment, Widget,
+    lctrl, CornerRounding, EventCtx, HorizontalAlignment, Key, Line, Outcome, Panel, PanelBuilder,
+    PanelDims, VerticalAlignment, Widget,
 };
 
 use crate::{App, BrowseNeighborhoods, Transition};
 
 pub fn app_top_panel(ctx: &mut EventCtx, app: &App) -> Panel {
-    Panel::new_builder(Widget::row(vec![
-        map_gui::tools::home_btn(ctx),
-        Line("Low traffic neighborhoods")
-            .small_heading()
-            .into_widget(ctx)
-            .centered_vert(),
-        map_gui::tools::change_map_btn(ctx, app).centered_vert(),
-        ctx.style()
-            .btn_plain
-            .icon("system/assets/tools/search.svg")
-            .hotkey(lctrl(Key::F))
-            .build_widget(ctx, "search")
-            .centered_vert(),
-    ]))
+    Panel::new_builder(
+        Widget::row(vec![
+            map_gui::tools::home_btn(ctx),
+            Line("Low traffic neighborhoods")
+                .small_heading()
+                .into_widget(ctx)
+                .centered_vert(),
+            map_gui::tools::change_map_btn(ctx, app).centered_vert(),
+            ctx.style()
+                .btn_plain
+                .icon("system/assets/tools/search.svg")
+                .hotkey(lctrl(Key::F))
+                .build_widget(ctx, "search")
+                .centered_vert(),
+        ])
+        .corner_rounding(CornerRounding::CornerRadii(CornerRadii {
+            top_left: 0.0,
+            bottom_left: 0.0,
+            bottom_right: 0.0,
+            top_right: 0.0,
+        })),
+    )
     .aligned(HorizontalAlignment::Left, VerticalAlignment::Top)
     .dims_width(PanelDims::ExactPercent(1.0))
     .build(ctx)
@@ -53,12 +62,19 @@ pub fn handle_top_panel(ctx: &mut EventCtx, app: &App, panel: &mut Panel) -> Opt
 
 pub fn left_panel_builder(ctx: &EventCtx, top_panel: &Panel, contents: Widget) -> PanelBuilder {
     let top_height = top_panel.panel_dims().height;
-    Panel::new_builder(contents)
-        .aligned(
-            HorizontalAlignment::Percent(0.0),
-            VerticalAlignment::Below(top_height),
-        )
-        .dims_height(PanelDims::ExactPixels(
-            ctx.canvas.window_height - top_height,
-        ))
+    Panel::new_builder(
+        contents.corner_rounding(CornerRounding::CornerRadii(CornerRadii {
+            top_left: 0.0,
+            bottom_left: 0.0,
+            bottom_right: 0.0,
+            top_right: 0.0,
+        })),
+    )
+    .aligned(
+        HorizontalAlignment::Percent(0.0),
+        VerticalAlignment::Below(top_height),
+    )
+    .dims_height(PanelDims::ExactPixels(
+        ctx.canvas.window_height - top_height,
+    ))
 }