always defined variable in root section because it gives you global reach through your entire Html document
you can define it in the Html section also so it can be
treated as a global variable.
5β£ conclusion
So many good uses, and weβre barely getting started Use the comments to ask follow-up questions or share your ideas for using CSS custom properties (variables).
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you can also apply multiple filters by using space.
2β£ Backdrop CSS filter CSS
The backdrop-filter property in CSS is used to apply filter effects support to the background/backdrop of an element. The backdrop filter has the same effect but applies only in the background.