New Editable Icon

The currently selected pencil symbol on the custom background color buttons does not supported across all devices (i.e., Androids at least). A new pencil (or other intuitive edit icon) should be used instead for consistency across platforms. (Note: If a pencil is used, it would likely be best to approximate the angle of the checkbox for visual consistency/appeal--naturally said, ideal angle could change if introducing a custom checkmark icon as well, but that character is less obscure and thus more widely supported across devices).

Locate the custom background color buttons and identify where the currently selected pencil symbol is defined. Check how it renders on Android and other supported devices; done means the edit control uses an intuitive, consistently rendered icon with visual alignment matching the checkbox.

Written by the indexing model from the issue text.