Learn CSS Variables by Building a City Skyline - Step 87

Tell us what’s happening:
Hello, I have something to ask about my code.
How are the percentage units of a building’s width related to the vh or vw units of its section’s borders? Additionally, how can we determine the specific vh or vw values for the borders to create a trapezoid or triangle effect in the top section? I’ve attempted to find tutorials on unit utilization on YouTube, but I only find them being used separately or together but not related
Could someone kindly explain it? I would greatly appreciate it

Your code so far

<!DOCTYPE html>
<html lang="en">    
  <head>
    <meta charset="UTF-8">
    <title>City Skyline</title>
    <link href="styles.css" rel="stylesheet" />   
  </head>

  <body>
    <div class="background-buildings">
      <div></div>
      <div></div>
      <div class="bb1 building-wrap">
        <div class="bb1a bb1-window"></div>
        <div class="bb1b bb1-window"></div>
        <div class="bb1c bb1-window"></div>
        <div class="bb1d"></div>
      </div>
      <div class="bb2">
        <div class="bb2a"></div>
        <div class="bb2b"></div>
      </div>
      <div class="bb3"></div>
      <div></div>
      <div class="bb4 building-wrap">
        <div class="bb4a"></div>
        <div class="bb4b"></div>
        <div class="bb4c window-wrap">
          <div class="bb4-window"></div>
          <div class="bb4-window"></div>
          <div class="bb4-window"></div>
          <div class="bb4-window"></div>
        </div>
      </div>
      <div></div>
      <div></div>
    </div>

    <div class="foreground-buildings">
      <div></div>
      <div></div>
      <div class="fb1 building-wrap">
        <div class="fb1a"></div>
        <div class="fb1b"></div>
        <div class="fb1c"></div>
      </div>
      <div class="fb2">
        <div class="fb2a"></div>
        <div class="fb2b window-wrap">
          <div class="fb2-window"></div>
          <div class="fb2-window"></div>
          <div class="fb2-window"></div>
        </div>
      </div>
      <div></div>
      <div class="fb3"></div>
      <div class="fb4"></div>
      <div class="fb5"></div>
      <div class="fb6"></div>
      
      <div></div>
      <div></div>
    </div>
  </body>
</html>
.fb1 {
  width: 10%;
  height: 60%;
}

.fb1a {
  border-bottom: 7vh solid var(--building-color4);
  border-left: 2vw solid transparent;
  border-right: 2vw solid transparent;
}

.fb1b {
  width: 60%;
  height: 10%;
  background-color: var(--building-color4);
}
  
.fb1c {
  width: 100%;
  height: 80%;
  background: repeating-linear-gradient(
      90deg,
      var(--building-color4),
      var(--building-color4) 10%,
      transparent 10%,
      transparent 15%
    ),
    repeating-linear-gradient(
      var(--building-color4),
      var(--building-color4) 10%,
      var(--window-color4) 10%,
      var(--window-color4) 90%
    );
}

.fb2 {
  width: 10%;
  height: 40%;
}

.fb2a {
  border-bottom: 10vh solid var(--building-color3);
  border-left: 1vw solid transparent;
  border-right: 1vw solid transparent;
  width: 100%;
}
.fb2b {
  width: 100%;
  height: 75%;
  background-color: var(--building-color3);
}

.fb2-window {
  width: 22%;
  height: 100%;
  background-color: var(--window-color3);
}

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36

Challenge: Learn CSS Variables by Building a City Skyline - Step 87

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