You can use the Dreamweaver highlighting preferences to customize the highlight colors for the outlines around the editable and locked regions of a template in Design view. The editable region color appears in the template as well as in documents based on the template.
Change template highlight colors
View highlight colors in the Document window
Select View > Visual
Aids > Invisible Elements.
Highlight colors appear in the document window only when View > Visual Aids > Invisible Elements is enabled and the appropriate options are enabled in Highlighting preferences.