Having trouble layering elements into container

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I am trying to place the orange icon and a few of those text boxes into the container on Editor X, but it is not allowing me to do-so. I go to the layer panel to try to do that, but again, it does not let me. Any clue on why it is not allowing me to place elements inside of my container? Also, the container resizes oddly on tablet and mobile view. Any fix on that as well?