The term 'The gradient color is套' is not clear. It seems like a mix of two different concepts. 'Gradient color' refers to a gradual transition between two or more colors, often used in design. The word '套' in Chinese can mean 'to cover' or 'to put on,' but it doesn't fit naturally with 'gradient color.' If you can provide more context or clarify the meaning, I can give a more accurate response.