Help with transparent images

So I need some help with transparent images. They show fine on PC, with a white background as you can see there is a lot of black on the image.

The problem is when they are displayed on the mobile app, it’d like almost a dark Grey or black background.

Have you got any ideas what I can do? These are the BEST images I can find. I was thinking maybe making the background color white or something but it never seems to reflect on mobile device.


Also, if you know a good way to be able to format the images boxes etc, make the images a bit small so they are not so cramed together that would be great.

Any good plugins or formatting rules etc.


Maybe use a photo editor to change the black text to blue or another color that is better visible on both white and black backgrounds? Or set mobile to the HA light theme.