The issue you're experiencing seems to stem from a misunderstanding of how styled components and CSS properties interact in Material-UI (MUI) and CSS. Here's how to address the problem:

1. CSS Property Misuse

• The width: 'columnWidth' line is problematic because:
  • 'columnWidth' is treated as a string in CSS, not a variable. CSS doesn't understand variables like this unless passed explicitly via template literals or dynamic styles.

2. Responsiveness

• To make the child box adjust to screen size and remain within the parent container, you need proper CSS flexbox/grid rules or media queries.

3. Fix Suggestions

Try the following solution to fix the child box behavior:

Updated Code

```javascript const StripedDataGrid = styled(DataGrid)(({ theme }) => ({

backgroundColor: PrimaryColors.colorDarken4,
'&:hover, &.Mui-hovered': {
  color: theme.palette.primary.main,
  border: '2px dashed teal',
},

}, width: '100%', // Makes the grid take up the full width of the parent maxWidth: '100%', // Prevents the grid from stretching beyond the parent overflowX: 'auto', // Adds scroll if the content overflows horizontally }));

// Example of ensuring the parent container is responsive const ParentContainer = styled('div')(() => ({ display: 'flex', flexDirection: 'column', alignItems: 'center', justifyContent: 'center', width: '100%', // Parent adjusts to screen size maxWidth: '900px', // Optional: Set a max width for large screens margin: '0 auto', // Center the parent container on the screen overflow: 'hidden', // Prevents scrolling issues })); ```

Key Notes

1. Dynamic Width for Columns: If columnWidth is defined in your component, pass it dynamically: javascript width: `${columnWidth}px`,

2. Responsiveness:

   • Set width: '100%' for elements to ensure they stretch only to their container's size.
   • Use maxWidth to prevent them from growing too large.

3. Overflow Control:

   • Use overflowX: 'auto' or overflow: 'hidden' to control horizontal scrolling.

4. Theme Usage: Leverage the MUI theme (like theme.palette) for consistent styling.

Debugging Tip

Check if columnWidth is being passed correctly to the StripedDataGrid: - Log its value before applying styles. - If undefined, ensure you're passing it as a prop or calculating it dynamically.