style-notebook.css

h3 {
    color: white;
    background-color: black;
    padding: 0.5em;
}

.CodeMirror {
    font-family: 'Monaco for Powerline';
}

div.cell.code_cell {
    font-family: 'Monaco for Powerline';
}

div.output_area pre {
    font-family: 'Monaco for Powerline';
}