I can think of five ways to potentially accomplish your goal:
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Use negative margins on the inner element to move it outside of the parent
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Use Javascript to move the inner element outside of the parent.
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Change the source code and move the inner element outside of the parent.
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Use
position: fixedon the inner element. This will allow the inner element to break out but has the down side that the element will be fixed at the given position (never moving). -
Remove the
position: relative;from the parent element or give the parent element aposition: static