Learn CSS Variables by Building a City Skyline Step #44

Hi, Im stuck trying to add a background with linear gradient property to a div element, the console asks me to add the background property and I am doing so! but the cosole keeps asking me to add the background property, I add it empty and nothing, I add any contentent to it and the console still asks me to add the background property, I am confused, previous steps I used 2 variables no problem but now it just wont accept the answer.

Instructions:

Add a linear-gradient to .bb1d with orange as the first color, --building-color1 as the second, and --window-color1 as the third. Remember to use the gradient on the background property.

My code so far:
CSS:

:root {
  --building-color1: #aa80ff;
  --building-color2: #66cc99;
  --building-color3: #cc6699;
  --building-color4: #538cc6;
  --window-color1: black;
}

* {
  border: 1px solid black;
  box-sizing: border-box;
}

body {
  height: 100vh;
  margin: 0;
  overflow: hidden;
}

.background-buildings, .foreground-buildings {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: flex-end;
  justify-content: space-evenly;
  position: absolute;
  top: 0;
}

/* BACKGROUND BUILDINGS - "bb" stands for "background building" */
.bb1 {
  width: 10%;
  height: 70%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.bb1a {
  width: 70%;
}

.bb1b {
  width: 80%;
}

.bb1c {
  width: 90%;
}
.bb1d {
  width: 100%;
  height: 70%;
  background: linear-gradient(
    orange,
    --building-color1,
    --window-color1
  );
  background-color: var(--building-color1);

}
.bb1-window {
  height: 10%;
  background: linear-gradient(
      var(--building-color1),
      var(--window-color1)
    );
}

.bb2 {
  width: 10%;
  height: 50%;
  background-color: var(--building-color2);
}

.bb3 {
  width: 10%;
  height: 55%;
  background-color: var(--building-color3);
}

.bb4 {
  width: 11%;
  height: 58%;
  background-color: var(--building-color4);
}

/* FOREGROUND BUILDINGS - "fb" stands for "foreground building" */
.fb1 {
  width: 10%;
  height: 60%;
  background-color: var(--building-color4);
}

.fb2 {
  width: 10%;
  height: 40%;
  background-color: var(--building-color3);
}

.fb3 {
  width: 10%;
  height: 35%;
  background-color: var(--building-color1);
}

.fb4 {
  width: 8%;
  height: 45%;
  background-color: var(--building-color1);
  position: relative;
  left: 10%;
}

.fb5 {
  width: 10%;
  height: 33%;
  background-color: var(--building-color2);
  position: relative;
  right: 10%;
}

.fb6 {
  width: 9%;
  height: 38%;
  background-color: var(--building-color3);
}
    

HTML

<!DOCTYPE html>
<html>    
  <head>
    <title>City Skyline</title>
    <link href="styles.css" rel="stylesheet" type="text/css" />   
  </head>

  <body>
    <div class="background-buildings">
      <div></div>
      <div></div>
      <div class="bb1">
        <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>
      <div class="bb3"></div>
      <div></div>
      <div class="bb4"></div>
      <div></div>
      <div></div>
    </div>

    <div class="foreground-buildings">
      <div></div>
      <div></div>
      <div class="fb1"></div>
      <div class="fb2"></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>

Console:

// running tests
You should use the background on .bb1d.
You should give the background property a linear-gradient.
You should use orange as the first color in the linear-gradient.
You should use --building-color1 as the second color in the linear-gradient.
You should use --window-color1 as the third color in the linear-gradient.
// tests completed

Also tried:

.bb1d {
  width: 100%;
  height: 70%;
  background: linear-gradient(
    orange,
    --building-color1,
    --window-color1
  );
}

same result…

Nvm I forgot to state var :rofl::

.bb1d {
  width: 100%;
  height: 70%;
  background: linear-gradient(
    orange,
    var(--building-color1),
    var(--window-color1)
  );
}
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