Learn CSS Variables by Building a City Skyline - Step 11

This is what was in the input field for me. The previous line for .background-buildings was not closed, so I have closed that. I added to the .bb1 class per the below and closed it. Now the error is stating i need to put them in order. I looked at the other solution for this and still cannot make sense of what im doing wrong. thanks.

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Challenge: Learn CSS Variables by Building a City Skyline - Step 11

Link to the challenge:

  </div>
  <div class="bb1">
    <div class="bb1a">
      <div class="bb1b">
        <div class="bb1c">
          <div class="bb1d">
</div>

You have nested four ‘div’ elements, but without their closing tags:

<div class="bb1a"></div>
.
.
.