The front page of soul

there is a soul app that is very popular recently. I want to know about this APP in addition to implementing clients (Android and Apple). How is its HTML page implemented?
is a class a framework? Or which method is used to make it?

May.10,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1ee012f-3a9c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ee012f-3a9c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?