plotly title font size

fig.update_layout(
    height=400,
    title=dict(
        text='<b>Life Expectancy - Our World in Data</b>',
        x=0.5,
        y=0.95,
        font=dict(
            family="Arial",
            size=20,
            color='#000000'
        )
    ),
    xaxis_title="<b>Continent</b>",
    yaxis_title='<b>Average Age</b>',
    font=dict(
        family="Courier New, Monospace",
        size=12,
        color='#000000'
    )
)