iPad Pro 9.7 safari screen background showing pink colour, how to fix this ?

As the Google logo (shown here in white text) does not also have a pink colour-cast, it is highly unlikely that your iPad or screen hardware has a fault. If you had a colour-related display fault, you would almost certainly not see any white-text as an overlay.

As such, select a different wallpaper image:

Settings > Wallpaper > Choose a New Wallpaper

If changing your iPad wallpaper does not resolve the problem, you will need to check key Accessibility settings that are intended to compensate for specific colour-vision issues:

Settings > Accessibility > Display & Text Size

Ensure that all settings enclosed within the red box above are switched OFF/Disabled.

If you’ve not added it as a wallpaper then there may be something going wrong with your ipad. You should make an appointment at an apple store or authorized service provider to have it checked out