The code returns the following error:

Unhandled promise rejection: CssSyntaxError: <css input>:1:57: The `bg-structo-background` class does not exist. If `bg-structo-background` is a custom class, make sure it is defined within a `@layer` directive.  
  
> 1 | tailwind utilities;@tailwind base;@tailwind components;  
    |                    ^  
  

Revise the code to address the error.

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