polygon border css - SERP Analysis

https://developer.mozilla.org/en-US/docs/Web/CSS/basic-shape/polygon

https://stackoverflow.com/questions/38021546/how-to-get-a-border-around-this-polygon

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https://www.freecodecamp.org/news/apply-borders-to-clip-paths-with-css/

https://www.w3schools.com/cssref/func_polygon.php

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https://codepen.io/bennettfeely/pen/azJWWX

https://verpex.com/blog/website-tips/css-shapes-polygon-starburst