One of my biggest gripes with RW is the corruption of colours that occurs when you use a colour picker. The issue is a MacOS bug that remains unfixed year after year. However, because RW only has the MacOS picker then there is no easy way around this.
The issue is that if you enter #0F76ED into the picker, it will corrupted into #005EE3.
The solution in Source is the ability to use a CSS Background and that provides an easy and accurate way to create a BG colour. So in this case if you want to use a colour such as #0F76ED, you could paste:
background-color: #0F76ED;
into the Custom CSS
