Material UI 5样式使用困惑：为何gridContainer类生效而boxContainer类不生效？

Hey there! I spotted the issue right away—let's break this down:

The Root Cause: A Tiny Typo in Prop Names #

Look closely at your <Box> components: you wrote classeName instead of className (missing an s).

React (and all MUI components) only recognize the standard className prop for applying CSS classes. Since classeName isn't a valid prop, your boxContainer styles never get attached to the Box elements. Meanwhile, your <Grid> uses the correct className={classes.gridContainer}, so those styles work perfectly.

Fixed Code Snippet #

Here's how to correct the Box components in your Home.jsx:

// Replace this:
<Box classeName={classes.boxContainer}>
// With this:
<Box className={classes.boxContainer}>

After fixing the typo, your boxContainer styles (flex alignment, margin, red background) should apply exactly as you intended.

Quick Extra Tip #

While makeStyles still works in MUI v5, the official recommendation is to use either the sx prop (for inline styling with theme integration) or the styled utility for custom component styles. But for your current setup, fixing the typo will get everything working smoothly.

内容的提问来源于stack exchange，提问作者Bataklik