Need a little help with media queries plz

i am trying to make the box -B appear when the screen is resized to 600px.
But it is not working.can u help me?

here is the link to the code:

Hi saejim,
the margin-top: -82px moves it out of view:

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Thanks Michael!
Can u suggest me how do i place the box-B right behind box-A otherwise?

You could just hide it by default:

.box-B {
  visibility: hidden;
  background-color: rgb(0, 247, 255);
  padding: 10px;
  border:5px solid black;
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