Improve contrast of Group D icon

Yesterday during the Bicycling Mag ride I noticed a yellow-orange circle beside all the riders in the nearby list. 

It was only when I saw a blue “C” icon that I realised that all the orange ones must be “D” icons. 

Due to the pale orange and the white text, contrast is very low so it’s hard to read.

Could that be improved?  In general I find contrast is OK, but it would be helpful to provide some settings for people without perfect colour vision or eyesight.

In general the full right hand pane listing the rider should have better contrast.  Just so hard to read on a large screen when it’s a few meters away!  The watts/kg is very hard to read and it an important figure to be looking at during rides or workouts.