html - How to get a border around this polygon? - Stack Overflow
css shapes - How to add border in my clip-path: polygon(); CSS style - Stack Overflow
Hexagons with rounded corners using `clip-path`
Understanding Clip Path in CSS - Ahmad Shadeed
CSS clip-path border
GitHub - georgewpark/CSS-Gradient-Clip-Path-Borders: This project demonstrates how the CSS clip-path property can be used to create a variety of shaped gradient borders.
How to add border in clip-path CSS – Sandesh S. Sardar
Creating rounded triangles in CSS with clip-path | CodyHouse