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html.Div([
html.Div([
html.H2('This is a dropdown example:', style={
'margin-right': '2em'})
]),
dcc.Dropdown(id='your-dropdown',
options=[
{'label': i, 'value': i} for i in range(1,10)],
placeholder="Select an option",
style={'width': '80%', 'padding': '3px', 'font-size': '20px', 'text-align-last': 'center'}),
] , style={'display': 'flex'}),