If you read the last part of my first book, I tried to make this computer pop-up look :

So, uh, here's the tutorial for it :

1. Change the background of the canvas to make it transparent
2. Go to the finger symbol, change the length of start and end to 0% and pick the square drawing tool

Note :

⬆️Comparisons of length(s) and brush sizes. If you want your pop-up to be more curved, use a bigger brush size.

3. Draw a big white rectangle

4. Resize it with transform > perspective mode
5. Add a new layer, then tap clipping
6. Turn on straight ruler

7. Draw a thick line with the color of your choice across the top of the rectangle
8. Add a new layer and move it to the bottom
9. Go to filter > style > stroke (outer) to make an outline if you want, it's optional

10. Add your text and don't forget to draw an 'X' on the top right
11. [Optional] if you want to make your pop-up look more 2000s-ish, merge all the layers except the text and 'X'.
12. Go to filter > style > bevel and you're done

*save it as transparent PNG

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B O N U S

How to make a mouse cursor :

1. Make the background transparent, and set the length of start and end to 0%
2. Turn on mirror ruler
3. Draw one side of a christmas tree and the other side will reflect it
4. Erase the excess, color it white, and done!

Play around with colors and shapes :

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Thank you for reading! If there is anything you don't understand please ask me.