Return HTML report file overall stat.

    :param overall_stat: overall stat
    :type overall_stat : dict
    :param digit: scale (the number of digits to the right of the decimal point in a number.)
    :type digit : int
    :param overall_param : Overall parameters list for print, Example : ["Kappa","Scott PI]
    :type overall_param : list
    :param recommended_list: recommended statistics list
    :type recommended_list : list or tuple
    :return: html_overall_stat as str

def html_overall_stat(
        overall_stat,
        digit=5,
        overall_param=None,
        recommended_list=()):
    """
    Return HTML report file overall stat.

    :param overall_stat: overall stat
    :type overall_stat : dict
    :param digit: scale (the number of digits to the right of the decimal point in a number.)
    :type digit : int
    :param overall_param : Overall parameters list for print, Example : ["Kappa","Scott PI]
    :type overall_param : list
    :param recommended_list: recommended statistics list
    :type recommended_list : list or tuple
    :return: html_overall_stat as str
    """
    result = ""
    result += "<h2>Overall Statistics : </h2>\n"
    result += '<table style="border:1px solid black;border-collapse: collapse;">\n'
    overall_stat_keys = sorted(overall_stat.keys())
    if isinstance(overall_param, list):
        if set(overall_param) <= set(overall_stat_keys):
            overall_stat_keys = sorted(overall_param)
    if len(overall_stat_keys) < 1:
        return ""
    for i in overall_stat_keys:
        background_color = DEFAULT_BACKGROUND_COLOR
        if i in recommended_list:
            background_color = RECOMMEND_BACKGROUND_COLOR
        result += '<tr align="center">\n'
        result += '<td style="border:1px solid black;padding:4px;text-align:left;background-color:{};"><a href="'.format(
            background_color) + DOCUMENT_ADR + PARAMS_LINK[i] + '" style="text-decoration:None;">' + str(i) + '</a></td>\n'
        if i in BENCHMARK_LIST:
            background_color = BENCHMARK_COLOR[overall_stat[i]]
            result += '<td style="border:1px solid black;padding:4px;background-color:{};">'.format(
                background_color)
        else:
            result += '<td style="border:1px solid black;padding:4px;">'
        result += rounder(overall_stat[i], digit) + '</td>\n'
        result += "</tr>\n"
    result += "</table>\n"
    return result