update togglebutton theme

src/App.tsx

@@ -65,6 +65,22 @@ export const applyThemeWithOverrides = (themeConfig: ThemeOptions): ThemeOptions
           },
         },
       },
+      MuiToggleButtonGroup: {
+        styleOverrides: {
+          grouped: {
+            margin: 4,
+            border: 0,
+            borderRadius: 4,
+            "&.Mui-disabled": {
+              border: 0,
+            },
+            "&.MuiToggleButtonGroup-middleButton, &.MuiToggleButtonGroup-lastButton": {
+              marginLeft: -1,
+              borderLeft: "1px solid transparent",
+            },
+          },
+        },
+      },
       MuiButton: {
         styleOverrides: {
           root: {