Colors can be customized inside your class diagram.
From the menu bar select Window > Preferences
>Soyatec > eUML2 Modeler > Class/Package Diagram > Colors.
Three options are available:
1.Color options
<1>. Use colors for visibility
<2>. Use colors for Archetypes
This preference allows you to put colors depending on Archetypes in your Class Diagram Editor .
For possibilities are provided :
<3>. Use fill gradient color
This preference allows you to fill your diagram with gradient color.
Eclipse presentation.
Eclipse presentation if Use of colors for borders is selected in the menu.
This option is available only with "Eclipse presentation style"
2. Color Set
This preference allows you to set color of the different elements which appear in your class diagram
3. Diagram Background Color
This preference allows you to set the bakckground color in your class diagram