<!-- Do not edit this file. It is automatically generated by API Documenter. --> [Home](./index.md) > [bitburner](./bitburner.md) > [UserInterfaceTheme](./bitburner.userinterfacetheme.md) > [backgroundprimary](./bitburner.userinterfacetheme.backgroundprimary.md) ## UserInterfaceTheme.backgroundprimary property **Signature:** ```typescript backgroundprimary: string; ```