when I hovered one element then other element is not affected || How to fixed it??(source code ⬇)

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Hi I wanted to know how can i have a date a calendar light up when I go over a holiday list.

Thanks

what if i want to change the color of first div when hover on second and change second when hover on first
because it is not working in this case

bheya golot dekhaya , hover 2 div pe kaam kar raha he ..... check karke deho ......

thanks for the video

.parent:hover + .child works for me like if work and correct if didn't.