freeCodeCamp/curriculum/challenges/english/01-responsive-web-design/css-variables-skyline/part-040.md

7.6 KiB

id title challengeType dashedName
5d822fd413a79914d39e98f0 Part 40 0 part-40

--description--

Gradients in CSS are a way to transition between colors across the distance of an element. They are applied to the background property and the syntax looks like this:

gradient-type(
  color1,
  color2
);

In the example, color1 is solid at the top, color2 is solid at the bottom, and in between it transitions evenly from one to the next. In bb1a, add a gradient of type linear-gradient to the background property with --building-color1 as the first color and --window-color1 as the second.

--hints--

test-text

const bb1a = code.match(/\.bb1a\s*{[\s\S]+?[^}]}/g)[0];
assert(
  /background\s*:\s*linear-gradient\(\s*var\(\s*--building-color1\s*\)\s*,\s*var\(\s*--window-color1\s*\)\s*\)\s*(;|})/g.test(
    bb1a
  )
);

--seed--

--seed-contents--

<!DOCTYPE html>
<html>    
  <head>
    <title>freeCodeCamp Skyline Project</title>
    <style>
      :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%;
        height: 10%;
        background-color: var(--building-color1);
      }
  
      .bb1b {
        width: 80%;
        height: 10%;
        background-color: var(--building-color1);
      }
  
      .bb1c {
        width: 90%;
        height: 10%;
        background-color: var(--building-color1);
      }

      .bb1d {
        width: 100%;
        height: 70%;
        background-color: var(--building-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);
      }
    </style>
  </head>

  <body>
    <div class="background-buildings">
      <div></div>
      <div></div>
      <div class="bb1">
        <div class="bb1a"></div>
        <div class="bb1b"></div>
        <div class="bb1c"></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>

--solutions--

<!DOCTYPE html>
<html>    
  <head>
    <title>freeCodeCamp Skyline Project</title>
    <style>
      :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%;
        height: 10%;
        background-color: var(--building-color1);
        background: linear-gradient(
            var(--building-color1),
            var(--window-color1)
          );
      }
  
      .bb1b {
        width: 80%;
        height: 10%;
        background-color: var(--building-color1);
      }
  
      .bb1c {
        width: 90%;
        height: 10%;
        background-color: var(--building-color1);
      }

      .bb1d {
        width: 100%;
        height: 70%;
        background-color: var(--building-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);
      }
    </style>
  </head>

  <body>
    <div class="background-buildings">
      <div></div>
      <div></div>
      <div class="bb1">
        <div class="bb1a"></div>
        <div class="bb1b"></div>
        <div class="bb1c"></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>