[docs] Add scrollbar to color picker demo (#43672)

Signed-off-by: sai chand <60743144+sai6855@users.noreply.github.com>
Co-authored-by: Zeeshan Tamboli <zeeshan.tamboli@gmail.com>

Author: sai6855

docs/data/material/customization/color/ColorDemo.js

@@ -58,7 +58,7 @@ function ColorDemo(props) {
             </Typography>
           </Toolbar>
         </AppBar>
-        <Box component="pre" sx={{ m: 2, fontSize: 16 }}>
+        <Box component="pre" sx={{ m: 2, fontSize: 16, overflowX: 'auto' }}>
           {`{
   palette: {
     primary: ${primary.output},