at-rule-name-case
Specify lowercase or uppercase for at-rules names.
   @media (min-width: 10px) {}
/** ↑
 * This at-rule name */Only lowercase at-rule names are valid in SCSS.
The fix
option can automatically fix some of the problems reported by this
rule.
Options
string: "lower"|"upper"
"lower"
The following patterns are considered violations:
@Charset 'UTF-8';@cHarSeT 'UTF-8';@CHARSET 'UTF-8';@Media (min-width: 50em) {}@mEdIa (min-width: 50em) {}@MEDIA (min-width: 50em) {}The following patterns are not considered violations:
@charset 'UTF-8';@media (min-width: 50em) {}"upper"
The following patterns are considered violations:
@Charset 'UTF-8';@cHarSeT 'UTF-8';@charset 'UTF-8';@Media (min-width: 50em) {}@mEdIa (min-width: 50em) {}@media (min-width: 50em) {}The following patterns are not considered violations:
@CHARSET 'UTF-8';@MEDIA (min-width: 50em) {}