snippet20.py

def make_box_layout():
     return widgets.Layout(
        border='solid 1px red',
        margin='0px 10px 10px 0px',
        padding='5px 5px 5px 5px'
     )
     
vbox1, vbox2 = make_boxes()
 
vbox1.layout = make_box_layout()
vbox2.layout = make_box_layout()
 
# really change vbox1 only
vbox1.layout.width = '400px'
vbox1.layout.border = 'solid 2px green'
 
widgets.HBox([vbox1, vbox2])