I want to add background color to my footer as shown below.

I'm not getting background color i added to my footer but it didn't work. below code only generates footer. how to get output as shown above making backgroundcolor
---
title: "123"
output:
pdf_document:
keep_tex: true
classoption: svgnames
header-includes:
- \usepackage{fancyhdr}
- \pagestyle{fancy}
- \fancyhead{}
- \fancyfoot{}
- \lfoot[LE,LO]{ABCDEFGHIJ 2020 1.3.4}
- \fancypagestyle{plain}{\pagestyle{fancy}}
---

