WhatsApp is going to roll up black mode for its iOS and Android users soon. The new mode, as the name implies, blacks the black background with black, which is more comfortable for eyes. The new mode will also help increase battery life on smartphones.
How can you do this here?
Start the WhatsApp app on your phone.
Go to Settings and tap on chat.
Choose 'solid color' to use preloaded wallpaper.
Choose the wallpaper library to try new themes.
This package is more and better background images for your chat.
Select the gallery if you want to make photos from your phone as a new background.
If you already do not want to use any loaded background, select "Wallpaper".