Add a border to flutter widget and customization

Adding border and customization is easy in Flutter because of BoxDecoration widget provided by flutter. In this article, I will demonstrate how to add a different border to the container using BoxDecoration widget

Add simple border with color

you can set decoration border property to set the color of the border.

    
       Container(
                padding: EdgeInsets.all(10),
                decoration: BoxDecoration(
                  border: Border.all(color: Colors.blueAccent)
                ),
                child: Text('Simple Border'),
              ),
    
flutter border with color

Change width of the border

All factory method in Border class have width property to set the width of the border

    
       Container(
                padding: EdgeInsets.all(10),
                decoration: BoxDecoration(
                  border: Border.all(color: Colors.blueAccent,width: 10)
                ),
                child: Text('Simple Border'),
              )
    
flutter border width

Add different borders for each side

You can use Border class instead of all factory method to set a different border to each side in the widget.

    
       Container(
                padding: EdgeInsets.all(10),
                decoration: BoxDecoration(
                  border: Border(
                    top: BorderSide(
                      width: 10,
                      color: Colors.amber
                    ),
                    bottom: BorderSide(
                      color: Colors.blue
                    )
                  )
                ),
                child: Text('Simple Border'),
              )
    
flutter border different border in each sidea

Round corner border/ Border radius

You can set borderRadius property in BoxDecoration class to give radius to the borders. You can specify the same radius for all the corners or different radius for each corner

Equal radius for all corners
    
       Container(
                padding: EdgeInsets.all(10),
                decoration: BoxDecoration(
                  borderRadius: BorderRadius.circular(10),
                  border: Border.all(color: Colors.blueAccent,width: 2)
                ),
                child: Text('Simple Border'),
              )
    
Flutter rounded corner border
Different radius to each corners
    
       Container(
                padding: EdgeInsets.all(10),
                decoration: BoxDecoration(
                  borderRadius: BorderRadius.only(topLeft: Radius.circular(10),bottomRight: Radius.circular(10)),
                  border: Border.all(color: Colors.blueAccent,width: 2)
                ),
                child: Text('Simple Border'),
              )
    
Flutter rounded corner

Conclusion

I hope you get an idea how to add border and customize that based on your need.

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