fix build on newer egui

src/math_app.rs

@@ -6,13 +6,13 @@ use crate::{
 };
 use eframe::App;
 use egui::{
-    Button, CentralPanel, Color32, ComboBox, Context, DragValue, Frame, Key, Layout, SidePanel,
-    TopBottomPanel, Ui, Vec2, Window, style::Margin,
+    Button, CentralPanel, Color32, ComboBox, Context, CornerRadius, DragValue, Frame, Key, Layout,
+    SidePanel, TopBottomPanel, Ui, Vec2, Window,
 };
 use egui_plot::Plot;
 
 use emath::{Align, Align2};
-use epaint::Rounding;
+use epaint::{Margin, Rounding};
 use instant::Instant;
 use itertools::Itertools;
 use std::{io::Read, ops::BitXorAssign};
@@ -535,11 +535,11 @@ impl App for MathApp {
         // Central panel which contains the central plot (or an error created when parsing)
         CentralPanel::default()
             .frame(Frame {
-                inner_margin: Margin::symmetric(0.0, 0.0),
-                rounding: Rounding::ZERO,
+                inner_margin: Margin::ZERO,
+                corner_radius: CornerRadius::ZERO,
                 // fill: crate::style::STYLE.window_fill(),
                 fill: Color32::from_gray(27),
-                ..Frame::none()
+                ..Frame::NONE
             })
             .show(ctx, |ui| {
                 // Display an error if it exists