We recently upgraded from PRTG 12 to 13 and the icons in the top right of the screen have changed colour to red from blue. The icons in question are the group that include "Send link by email" on the group root page and the "Pause" and "Add sensor" buttons on the device pages. I think the group of icons is called ui_icons_454545_256x240 and when I've checked the group they are grey in the picture.
We would like to change the colour of these buttons back to blue but cannot see how to do it. Any help would be greatly appreciated.