Changing background color

Hello, I wanted to change the background of the footer for a specific page. I installed the Squarespace ID finder plungin and targed the footer but when I put 

#collection-65e8d0dd2623095fa6eeabae footer {
  background-color: green;
}

in custom css, it only changes the border color, which I also added through custom css, and doesn't change the actual background color. I was wondering if there is a way to override the color theme or edit the color themes in custom css. Thank you!

Use this code instead. If it doesn't work, please share site url, we can check easier

#collection-65e8d0dd2623095fa6eeabae footer.sections {
	section, .section-border, .section-background {
		background-color: green !important;
}
}