What is the naming convention for this css?

<style>
  .user {
    width: 100rpx;
    height: 100rpx;
    position: relative;
  }
  .user__avatar {
    display: block;
    width: 100rpx;
    height: 100rpx;
    border-radius: 50%;
  }
  .user__un-read-msg-count {
    position: absolute;
    top: -16rpx;
    right: -8rpx;
  }
</style>
Css
Mar.07,2021

this is the bem specification
bem

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-64f5-1eae51e-47f9c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eae51e-47f9c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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