Adjusting logo in beamercolorbox

I am making a presentation and I’d like to add a logo on the bottom right side of all frames except the titlepage. First, I set four beamercolorboxes , the last one for the logo. it was not aligned well. Then, added the logo into the third beamercolorbox. It seems to be aligned, however, it has made the date and page number seem blurred plus the color of the image itself has been changed from white to the color of the beamercolorbox. I want to the image rather to come to the front.

MWE

documentclass[11pt]{beamer}
usepackage[utf8]{inputenc}
usepackage[T1]{fontenc}
usepackage{lmodern}
usepackage[export]{adjustbox}
usepackage{tikz}
usetikzlibrary{positioning}
setbeamertemplate{headline}{}
setbeamercovered{transparent}
usetheme{Madrid}
useoutertheme{miniframes} 
useinnertheme{circles}
setbeamercolor{subsection in head/foot}{bg=black,fg=white}

deflogo{%
    includegraphics[fbox, ,width=1cm, height=3ex,raise=-0.6ex]{polyLogo.pdf}%
}

setbeamerfont{footline}{size=fontsize{6}{6}selectfont}
setbeamercolor{section in foot}{bg=gray,fg=white}
setbeamercolor{subsection in foot}{bg=black,fg=white}


setbeamertemplate{footline}
{
    hbox{%
        begin{beamercolorbox}[wd=.35paperwidth,ht=2.6ex,dp=1ex,center]{section in foot}%
            usebeamerfont{section in foot}insertshortauthor
        end{beamercolorbox}%
    % here I replace insertsubtitle with insertshorttitle
        begin{beamercolorbox}[wd=.30paperwidth,ht=2.6ex,dp=1ex,center]{subsection in foot}%
            usebeamerfont{section in foot}insertshorttitle
        end{beamercolorbox}%
        pgfsetfillopacity{0.5}begin{beamercolorbox}[wd=.35paperwidth,ht=2.6ex,dp=1ex,center]{subsection in foot}%
            usebeamerfont{section in foot} text{today} hspace{0.1 in} insertframenumber/inserttotalframenumberhfillsetlengthfboxrule{0pt}logohfill
        end{beamercolorbox}%
    }%
    
    vskip0pt%
}

usepackage{xcolor}
usepackage{booktabs}
setbeamercolor{framesource}{fg=gray}
setbeamerfont{framesource}{size=tiny}
newcommand{source}[1]{begin{textblock*}{4cm}(8.7cm,8.6cm)
        begin{beamercolorbox}[ht=0.5cm,right]{framesource}
            usebeamerfont{framesource}usebeamercolor[fg]{framesource} Source: {#1}
        end{beamercolorbox}
end{textblock*}}
title[VeryCoolVeryCool]{smalltextbf{documenttitle}}
subtitle{small DVeryCoolVeryCoolVeryCool}
author[VeryCoolVeryCoolVeryCool] {VeryCoolVeryCool}
institute[]
{} 
date[Winter 2021] % (optional)
{VeryCoolVeryCoolVeryCoolVeryCoolVeryCool vspace{0.1 in}}
newcommand{documenttitle}{VeryCoolVeryCoolVeryCoolVeryCoolVeryCoolVeryCoolVeryCoolVeryCool}


begin{document}
    begin{frame}[plain]
        titlepage
    end{frame}
section{Outline}
begin{frame}
    frametitle[allowframebreaks]{Outline}
    tableofcontents
end{frame}
section[intro]{A Cool Theory}
begin{frame}{Rules}
    frametitle{Brief History }
        These are the principal rules:
end{frame}
end{document}

EDIT: cannot upload the image polyLogo.pdf , thus, uploaded the .PNG version of it. Thus, it just needs to be replaced by polyLogo.PNG.

Any workaround would be appreciated.