The shadow highlighting the new event position during moving and resizing uses semi-transparent background.

You can customize it by modifying the *_shadow and *_shadow_inner classes in the CSS theme.

.scheduler_default_shadow_inner 
{
  background-color: #666666;
  opacity: 0.5;
  height: 100%;
}

Availability

Availability of this feature in DayPilot editions:

LitePro
DayPilot for JavaScript
DayPilot for ASP.NET WebForms
DayPilot for ASP.NET MVC
DayPilot for Java