def color_reliability(val):
    """Returns different shades of green for different levels of similarity."""

    if val == 'EXTREMA':
        color='#1f7a1f'
        return f'background-color: {color}'
    elif val == 'ALTA':
        color='#85e085'
        return f'background-color: {color}'
    elif val == 'MÉDIA':
        color='#d8ebb5'
        return f'background-color: {color}'
    else:
        pass