How to achieve text size adaptation in ionic 3

ionic"s html tag sets font-size:62.5%;, that is, 1remoulder 10px; but the font size set with rem is still fixed and will not change with the width of the phone screen. Is the font size of ionic set dead?

Sep.16,2021
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-64f5-1bec47a-31ac3.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bec47a-31ac3.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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