a banner, or more like my definition of it, is a signature or finishing touch at the end of each chapter and it usually has either their name or username on it— like the ones you see at the end of all the chapters in this book.
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tutorial
it's really simple to make:
1. select a fully white picture or a transparent png, and crop it so it's vertically short and horizontally long
* however, if you're using a transparent png, do not crop it or else it will not be transparent anymore (I've tried).
2. open any text editing app, I recommend Phonto (more on how to use it in the previous chapter)
3. type your username/name in. you can change the colour, add a shadow or even a small picture.
and there, you're done!