feedback(adapt on mobile and pc)

src/theme/theme.tsx

@@ -0,0 +1,15 @@
+import { createTheme } from '@mui/material/styles';
+
+const theme = createTheme({
+  breakpoints: {
+    values: {
+      xs: 0,
+      sm: 600,
+      md: 900,
+      lg: 1200,
+      xl: 1536,
+    },
+  },
+});
+
+export default theme;