I could not understand the error please

.fb5{
  background: repeating-linear-gradient (--building-color2 0% 5% , transparent 5% 10%);
  width: 10%;
  height: 33%;
  
  position: relative;
  right: 10%;
 }

the error is : You should give .fb5 a background property.

Please Tell us what’s happening in your own words.

Learning to describe problems is hard, but it is an important part of learning how to code.

Also, the more you say, the more we can help!

We unfortunately cannot see your code.

i just edited it , you can see it now .

Ok, what about that error message do you not understand?

Also, please post all of your code instead of just part of it.

everything seems normal , i don’t understand the error !!
i did write background !!

anyone could help ? thank you

We need to see the full code and the url of the project step.

here is the URL thanks https://www.freecodecamp.org/learn/2022/responsive-web-design/learn-css-variables-by-building-a-city-skyline/step-104

That does not give us all of the code that you wrote. You need to put all of your code into a post.

:root {
  --building-color1: #aa80ff;
  --building-color2: #66cc99;
  --building-color3: #cc6699;
  --building-color4: #538cc6;
  --window-color1: #bb99ff;
  --window-color2: #8cd9b3;
  --window-color3: #d98cb3;
  --window-color4: #8cb3d9;
}

* {
  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;
}

.building-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.window-wrap {
  display: flex;
  align-items: center;
  justify-content: space-evenly;
}

/* BACKGROUND BUILDINGS - "bb" stands for "background building" */
.bb1 {
  width: 10%;
  height: 70%;
}

.bb1a {
  width: 70%;
}
  
.bb1b {
  width: 80%;
}
  
.bb1c {
  width: 90%;
}

.bb1d {
  width: 100%;
  height: 70%;
  background: linear-gradient(
      var(--building-color1) 50%,
      var(--window-color1)
    );
}

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

.bb2 {
  width: 10%;
  height: 50%;
}

.bb2a {
  border-bottom: 5vh solid var(--building-color2);
  border-left: 5vw solid transparent;
  border-right: 5vw solid transparent;
}

.bb2b {
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
      var(--building-color2),
      var(--building-color2) 6%,
      var(--window-color2) 6%,
      var(--window-color2) 9%
    );
}

.bb3 {
  width: 10%;
  height: 55%;
  background: repeating-linear-gradient(
      90deg,
      var(--building-color3),
      var(--building-color3),
      var(--window-color3) 15%
    );
}

.bb4 {
  width: 11%;
  height: 58%;
}

.bb4a {
  width: 3%;
  height: 10%;
  background-color: var(--building-color4);
}

.bb4b {
  width: 80%;
  height: 5%;
  background-color: var(--building-color4);
}
  
.bb4c {
  width: 100%;
  height: 85%;
  background-color: var(--building-color4);
}

.bb4-window {
  width: 18%;
  height: 90%;
  background-color: var(--window-color4);
}

/* FOREGROUND BUILDINGS - "fb" stands for "foreground building" */
.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 {
  width: 100%;
  border-bottom: 10vh solid var(--building-color3);
  border-left: 1vw solid transparent;
  border-right: 1vw solid transparent;
}

.fb2b {
  width: 100%;
  height: 75%;
  background-color: var(--building-color3);
}

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

.fb3 {
  width: 10%;
  height: 35%;
}
  
.fb3a {
  width: 80%;
  height: 15%;
  background-color: var(--building-color1);
}
  
.fb3b {
  width: 100%;
  height: 35%;
  background-color: var(--building-color1);
}

.fb3-window {
  width: 25%;
  height: 80%;
  background-color: var(--window-color1);
}

.fb4 {
  width: 8%;
  height: 45%;
  position: relative;
  left: 10%;
}

.fb4a {
  border-top: 5vh solid transparent;
  border-left: 8vw solid var(--building-color1);
}

.fb4b {
  width: 100%;
  height: 89%;
  background-color: var(--building-color1);
  display: flex;
  flex-wrap: wrap;
}

.fb4-window {
  width: 30%;
  height: 10%;
  border-radius: 50%;
  background-color: var(--window-color1);
  margin: 10%;
}
.fb5{
  background: repeating-linear-gradient (
    --building-color2 0% 5% ,
    transparent 5% 10% 
    );
  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 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 building-wrap">
        <div class="fb3a window-wrap">
          <div class="fb3-window"></div>
          <div class="fb3-window"></div>
          <div class="fb3-window"></div>
        </div>
        <div class="fb3b"></div>
        <div class="fb3a"></div>
        <div class="fb3b"></div>
      </div>
      <div class="fb4">
        <div class="fb4a"></div>
        <div class="fb4b">
          <div class="fb4-window"></div>
          <div class="fb4-window"></div>
          <div class="fb4-window"></div>
          <div class="fb4-window"></div>
          <div class="fb4-window"></div>
          <div class="fb4-window"></div>
        </div>
      </div>
      <div class="fb5"></div>
      <div class="fb6"></div>
      <div></div>
      <div></div>
    </div>
  </body>
</html>

I’ve edited your code for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (').

The background needs to come after the background-color.

i did that but still same problem !

It is a different problem if you put the background property after the background-color property.

i have the same error message for both !

What does your code look like when you move the background property?

Edit - ah, I had also fixed your bad variable syntax to get a different error message.

Your bad variable syntax is breaking the entire property.

This isn’t how you use a CSS variable.

the error becomes “You should give the repeating-linear-gradient a first color of --building-color2 from 0% to 5% .” i tried it .

New error messages mean progress.

So now you need to look back at how you previously used repeating-linear-gradient because that’s not what you are doing here.

repeating-linear-gradient(
    var(--building-color2)0%,
    var(--building-color2) 5%,
    transparent 5% ,
    transparent 10%

success ,thank you

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