How does webpack4 package multiple independent css?

how does webpack4 package multiple independent css
for example, you need to generate 2 css

all.css //css
a.css

both css are generated by packaging and merging of several third-party css.
if you package a css, you can reference a third-party css, one by one in js and then package it to generate, but the above two need to be packaged separately

Sep.23,2021
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-64f5-1b38e80-344ff.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b38e80-344ff.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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