Custom Form thank you message CSS

I have searched and can’t find it!

Can someone please point me at the CSS to change the colour of the ‘thank you’ message that pops up after a contact completes my custom form please?



In the ‘edit form’ page I can customise hte message but not the colour / style.



Many thanks,



Richard

I have searched and can’t find it!
Can someone please point me at the CSS to change the colour of the ‘thank you’ message that pops up after a contact completes my custom form please?

In the ‘edit form’ page I can customise hte message but not the colour / style.

Many thanks,

Richard