Use color cards

hi,

I recently migrated from 4.3 in hosted mode and users complaint about the readability of the task board and the planning board. It's mainly white on a white background and very hard to read.

Previously we had different colors per card. Now, the color is only used on the left side of the card but it's not really easy to read.

Is it possible to have a pale version of the card color used for all the card ?
By pale version, I mean a lighter version of the color configured for the card for the whole card and the color itself for the left side only.