change color of scatter plotly code example

Example: go.scatter

import plotly.graph_objects as go

fig = go.Figure()

# Add traces
fig.add_trace(go.Scatter(x=df['col_x'], y=df['col_y'],
                    mode='markers',
                    name='markers'))
fig.add_trace(go.Scatter(x=df2['col_x'], y=df2['col_y'],
                    mode='lines+markers',
                    name='lines+markers'))

fig.show()