Change the background color inside contener

Is possible to change the color of the background inside the container? (gray color around the picture). this happens after resizing to “contain”. I am asking because I do not want to alter the size of each gif, I am looking for a faster solution.

What is the container? A Group? A Row/Column?

Are you wanting to do this manually in the properties panel or dynamically using blocks?

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the point is, gifs are too big. this can be fixed in blocks using “resize mode” but there is a gray background on the sides. Can this gray background be removed?