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Reduce space between two divs

I have to datatables and i want to reduce the space between them

here is my code
html.Div([
html.Div([
html.H6(‘Baseline & VDP Baseline (w/o promo.) & YoY Changes’,
className=“gs-header gs-table-header”),
dt.DataTable(
rows=[{}],
# columns=sorted(df_deltatable.columns),
sortable=False,
column_widths=[50,40,40,40,40,50,50,50],
max_rows_in_viewport=13,
row_height=18,
id=‘historical_table’
)
], className=“six columns”,style={‘display’:‘inline-block’}),
html.Div([
html.H6(‘Actuals & VDP+ (incl. promo.) & YoY Changes’,
className=“gs-header gs-table-header”),
dt.DataTable(
rows=[{}],
# columns=sorted(df_deltatable.columns,‘descending’),
sortable=False,
column_widths=[50,40,40,40,40,50,50,50],
max_rows_in_viewport=13,
row_height=18,
id=‘forecast_table’
)
], className=“six columns”,style={‘display’:‘inline-block’})
],className=“row”)