**Acceptance criteria**

* Begin of the insertionTheEnd of the insertion Begin of the deletion Light: changeEnd of the deletion default Begin of the insertionbackground color for the left-hand sidebar isEnd of the insertion Begin of the deletion toEnd of the deletion white Begin of the insertion(#FFFFFF). This affects

* New instances

* Existing instances that did not configure a custom color for the sidebar

* Existing instances when they had a custom color and change backEnd of the insertion Begin of the deletion (similarEnd of the deletion to Begin of the insertionthe default scheme (via the select field in Admin/Design)

End of the insertion Begin of the deletion GitHub light mode)


**Technical notes**

End of the deletion * Begin of the insertionAll instances that have a custom color configured for the sidebar will keep that colourEnd of the insertion Begin of the deletion <br>End of the deletion


**Out of scope**

* Begin of the insertionRemoving the optionEnd of the insertion Begin of the deletion Overwrite existing custom stylings (separate step)


_Set the_ **To be informed/consulted teams** _fieldEnd of the deletion to Begin of the insertionconfigureEnd of the insertion Begin of the deletion include all teams necessary to be informed ofEnd of the deletion the Begin of the insertionsidebar background colorEnd of the insertion Begin of the deletion changes._End of the deletion