Configure spacing between plots and widgets

The following is a minimal reproducible example of a problem I am facing. The left Select box from the following code is being covered by the plot itself, and I cannot figure out how to space them apart properly.

from bokeh.plotting import figure, show
from bokeh.layouts import layout, column
from bokeh.models.widgets import Select

a = Select(title="A", value="A", options=["A", "B"], width=100)
b = Select(title="B", value="B", options=["A", "B"], width=100)

p = figure(plot_height=600, plot_width=600)
inputs1 = column([a])
inputs2 = column([b])

l = layout([
    [inputs1, p, inputs2],
], sizing_mode='fixed')

show(l)

As a gentle suggestion to help others who want to help you, please always include relevant version information

There was a giant overhaul of the layout system in Bokeh 1.1, so my first suggestion is to update your installed Bokeh version. For reference, with Bokeh 1.2 your code above produces the output below, with no overlap.

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