How to change profile text and border color?

[yogurt shart]

I recently came across this steam profile that specifically worked on steam profile exploits and they somehow learned how to change the color of their steam profile text and borders and I was wondering if there's anyone out there who knows what they did for that to happen? I asked the owner of the account in their comment section but I doubt they'll respond. Here's their profile for reference: https://steamcommunity.com/id/TheMightyG3/

[cSg|mc-Hotsauce]

Purchase a 256GB or a 512GB Steam Deck for the special Steam Deck profile bundle.

https://store.steampowered.com/steamdeck

I have that profile bundle myself.

If you ever want to know what points shop items a user has enabled, you can click in the little person icon on their profile under the Add a Friend and Award button.