You cannot change it transparent… Better change notifier to light theme…
Use vertical arrangement instead of card view
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Use any type of arrangement instead and make it as card view. This may be better option to you. I am also doing same in my project for custom notifier.
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Set notifier background color to Transparent.
Edit : Sorry for Replying too Late ! 
use this extension :
I know that I know that you are So much more intelligent than me that you create Extensions for Kodular and not a noob like me
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