Thanks Ziggy - I am trying change all instances of one colour to another in all themes - rather than going through and manually changing each instance of the colour. Is there a way to do this that you are aware of?
Also, you can see in the screen shot below that I have a dark colour set to the bottom right yet the buttons are not utilising this colour, they are instead a staight black? This doesn't make sense to me why this is happening? Do you know why and how I can fix this?