So as I'm getting back into palette making, I'm trying to figure out new coding and cool little features to add. I'd love to get some help/figure out the coding for the following. If you can help, please let me know! Any help is appreciated :)

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1. How to add a drop shadow like effect to chat boxes, page background, etc.

2. How to alternate the colors of the chat (ie: say blue message, then white message)

3. How to change the header when you hover over the navigation bar

4. How to remove the tiny picture above the chatbox