ABOUT US CSS Custom Electronics in Elsmere, DE, provides home entertainment that is designed to meet our clients' expectations. The solutions offered are easy to use because relaxing and having fun shouldn't be hard to do. Its All About the Experience. CSS Custom Electronics has been bringing quality service to the tri-state area since August, 1994. With Delaware roots, the President is a fourth generation native Delawarean. Relationships with our clients are considered long-term. Customer Service is our primary concern. MISSION STATEMENT CSS custom electronics strives to provide whole solutions for our clients' entertainment environment and security. CSS is a provider of integrated electronic systems for your home and office. Our services include design installation and integration of systems for Entertainment (Audio/Video), Communication (Voice and Data Networking), Comfort (Control Systems for Lighting and HVAC), and Security (Burgular/Fire Alarm, Access Control, Cameras) as well as..