fixed layout issue

src/app.rs

@@ -3,9 +3,8 @@ use std::thread;
 
 use arboard::{Clipboard, ImageData};
 use eframe::egui::{
-    self, Align2, Color32, ColorImage, Context, CornerRadius, DragValue, Event, Frame, Key,
-    Response, RichText, Sense, Slider, Stroke, StrokeKind, TextureHandle, TextureOptions, Ui,
-    Vec2,
+    self, Align2, Color32, ColorImage, Context, CornerRadius, DragValue, Event, FontId, Frame, Key,
+    Response, RichText, Sense, Slider, Stroke, StrokeKind, TextureHandle, TextureOptions, Ui, Vec2,
 };
 use rand::Rng;
 
@@ -153,10 +152,30 @@ impl TerrainApp {
         let button_size = Vec2::new(28.0, 28.0);
         let button_rect = Align2::RIGHT_TOP
             .align_size_within_rect(button_size, anchor_rect.shrink2(Vec2::new(8.0, 8.0)));
-
-        let response = ui.put(
+        let response = ui.interact(
             button_rect,
-            egui::Button::new(RichText::new("🗍").size(14.0)),
+            ui.make_persistent_id(("main_copy_button", preview == PreviewFocus::Bumpmap)),
+            Sense::click(),
+        );
+
+        let fill = if response.hovered() {
+            Color32::from_rgba_premultiplied(70, 90, 120, 220)
+        } else {
+            Color32::from_rgba_premultiplied(40, 40, 40, 180)
+        };
+        ui.painter().rect_filled(button_rect, CornerRadius::same(6), fill);
+        ui.painter().rect_stroke(
+            button_rect,
+            CornerRadius::same(6),
+            Stroke::new(1.0, Color32::from_rgba_premultiplied(255, 255, 255, 60)),
+            StrokeKind::Outside,
+        );
+        ui.painter().text(
+            button_rect.center(),
+            Align2::CENTER_CENTER,
+            "🗍",
+            FontId::proportional(14.0),
+            Color32::WHITE,
         );
 
         if response.clicked() {