Changing background on newly created additional widget that’s just an image

Hello there,

I am probably missing the blindingly obvious here, so hoping you can help me. I have been changing the background on my homepage widgets successfully using the following additional CSS:

#shapely_home_parallax-4 >
section{background: #ffff

This works perfectly. However, I am wanting to change the background to an additional widget I have just created (widget ID: media_image-3). However, when I enter the same CSS principles in, nothing is happening with this:

section{background: #ffff

Would you be able to advise please what I am missing?

Thank you in advance, Victoria

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