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Dropdown focus highlight

Hello!
I’m trying to change the color of highlight on focusing for Dropdown from dash_core_components. I’ve changed the color of focus for selecting Dropdown options by using css:

#subject .VirtualizedSelectFocusedOption {
background-color: #b8d98a;
}

image


but I can't realize how to change the color of Dropdown focus itself (blue contour):

image


Code of my Dropdown control:

    dcc.Dropdown(
        id = 'subject',
        options = [
            {'value': 0, 'label': 'Subject 1'},
            {'value': 1, 'label': 'Subject_2'}
        ],
        className = 'two columns',
    )