Search the Hack The Box Forum for "Bulma" to find hints or links to official write-ups after the machine has been retired.
"Bulma" is sometimes the name of a vulnerable machine or challenge in cyber security labs (like Hack The Box or VulnHub). A "solid write-up" in this case would be a detailed walkthrough on how to exploit the machine or find the "flags" hidden within it. If you are looking for the Bulma CSS Framework:
If you need a reliable starting point for the Bulma CSS framework , it is best to use official or well-vetted sources rather than downloading unknown .rar files, which can pose security risks.
Many researchers post their walkthroughs on platforms like Medium or GitHub Pages.