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Fixed CSS variable detection Syntax
It resolves the issue #3823
Changes
There is a bug in src/languages/lib/css-shared.js file.

adding an underscore( _ ) in CSS_VARIABLES fixes the problem.
Code Before:
CSS_VARIABLE: {
className: "attr",
begin: /--[A-Za-z][A-Za-z0-9_-]*/
}
Code After:

CSS_VARIABLE: {
className: "attr",
begin: /--[A-Za-z_][A-Za-z0-9_-]*/
//Look change in ^ here
}
Checklist
CHANGES.md