[Feature]: Add option for blur effect value

[iHeadway]

Is there an existing issue for this?

• [X] I have searched the existing issues

Is your feature request related to a problem? Please describe.

No

Describe your idea or feature request

Just like opacity option but for blurriness.

Anything else?

No

[aurexav]

I'm really looking forward to this.

Current theme is too blur...