I use missingno heatmap visualization and would like to add a line \ border to show the different values. While I can adjust the font size, e.g. msno.heatmap(df, fontsize=20). I couldn't find a way to adjust this property from the heatmap creating method. The following attempts yield TypeError -
msno.heatmap(df, linecolor='black')
msno.heatmap(df, line_color='black')
msno.heatmap(df, bordercolor='black')
msno.heatmap(df, border_color='black')