A handy component that can be used to add outlines to your Unity UI https://youtu.be/BEh2s9NOTiE
If you want to support the development of Pico Tanks you can download it on the Google Play Store or the Apple App Store.
This project was built using Unity 2020.3.13f1. The shaders were created with Amplify Shader Editor (ASE v1.8.8 rev 14:) plugin but you don't need it to run the project, edit or use the shaders. ASE will make understanding and editing the shader much easier. http://amplify.pt/unity/amplify-shader-editor
I hope someone appreciates the share :) Have fun!