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W3.CSS
Colored Navigation Bars
Use the w3-color class to add a background color to the navigation bar:
Home
Link 1
Link 2
Link 3
Home
Link 1
Link 2
Link 3
Home
Link 1
Link 2
Link 3
Home
Link 1
Link 2
Link 3
Home
Link 1
Link 2
Link 3