freeCodeCamp/curriculum/challenges/english/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/6196cee94c6da1253809dff9.md

---
id: 6196cee94c6da1253809dff9
title: Step 20
challengeType: 0
dashedName: step-20
---

# --description--

Target the `.back-mountain` element, and set its `width` and `height` to `300px`. Then, set the `background` to a linear gradient starting at `rgb(203, 241, 228)` and ending at `rgb(47, 170, 255)`.

# --hints--

You should use the `.back-mountain` selector.

```js
assert.match(code, /\.back-mountain\s*\{/);
```

You should give `.back-mountain` a `width` of `300px`.

```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.back-mountain')?.width, '300px');
```

You should give `.back-mountain` a `height` of `300px`.

```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.back-mountain')?.height, '300px');
```

You should give `.back-mountain` a `background` of `linear-gradient(rgb(203, 241, 228), rgb(47, 170, 255))`.

```js
assert.include(['linear-gradient(rgb(203,241,228),rgb(47,170,255))', 'rgba(0,0,0,0)linear-gradient(rgb(203,241,228),rgb(47,170,255))repeatscroll0%0%'], new __helpers.CSSHelp(document).getStyle('.back-mountain')?.getPropVal('background', true));
```

# --seed--

## --seed-contents--

```html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <link rel="stylesheet" type="text/css" href="./styles.css" />
    <title>Penguin</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  </head>

  <body>
    <div class="left-mountain"></div>
    <div class="back-mountain"></div>
    <div class="penguin"></div>
    <div class="ground"></div>
  </body>
</html>
```

```css
body {
  background: linear-gradient(45deg, rgb(118, 201, 255), rgb(247, 255, 222));
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100vh;
  overflow: clip;
}

.left-mountain {
  width: 300px;
  height: 300px;
  background: linear-gradient(rgb(203, 241, 228), rgb(80, 183, 255));
  position: absolute;
  transform: skew(0deg, 44deg);
  z-index: 2;
  margin-top: 100px;
}

--fcc-editable-region--

--fcc-editable-region--

.penguin {
  width: 300px;
  height: 300px;
  margin: auto;
  margin-top: 75px;
}

.ground {
  width: 100vw;
  height: 400px;
  background: linear-gradient(90deg, rgb(88, 175, 236), rgb(182, 255, 255));
  z-index: 3;
  position: absolute;
  margin-top: -58px;
}
```
feat(curriculum): add css-penguin practice project (#44214) * feat: add css-penguin practice project * rename block name * rename meta block * rename necessary properties * rename page * add to step 25 * adjust prototype with better structure/naming * add step adjusting .ground z-index * fix: add position: absolute to .ground * add to step 37 * add to step 103 * remove erm from solution * add tests to 001-020 * add tests 021-030 * test: update 012 to use dynamic hints * test: improve tests with dynamic hints * fix: add position:relative to .penguin * add tests 032-055 * add tests 056 - 103 * fix some tests * code blocks and test fixes Co-authored-by: Krzysztof G. <60067306+gikf@users.noreply.github.com> * allow 0% 0px 0 * fix: add width and height step for silly firefox * add instruction to add html element * Tom's good suggestions, and his American suggestions Co-authored-by: Tom <20648924+moT01@users.noreply.github.com> * adjust wording for - you guessed it - firefox Co-authored-by: Tom <20648924+moT01@users.noreply.github.com> * add missing calc keyword * just fix it with regex :( * apply Nich's probably bogus suggestions Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com> * remove duplicate Co-authored-by: Krzysztof G. <60067306+gikf@users.noreply.github.com> Co-authored-by: Tom <20648924+moT01@users.noreply.github.com> Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com> 2021-12-03 23:59:32 +00:00			`---`
			`id: 6196cee94c6da1253809dff9`
			`title: Step 20`
			`challengeType: 0`
			`dashedName: step-20`
			`---`

			`# --description--`

			Target the `.back-mountain` element, and set its `width` and `height` to `300px`. Then, set the `background` to a linear gradient starting at `rgb(203, 241, 228)` and ending at `rgb(47, 170, 255)`.

			`# --hints--`

			You should use the `.back-mountain` selector.

			```js
			`assert.match(code, /\.back-mountain\s*\{/);`
			```

			You should give `.back-mountain` a `width` of `300px`.

			```js
			`assert.equal(new __helpers.CSSHelp(document).getStyle('.back-mountain')?.width, '300px');`
			```

			You should give `.back-mountain` a `height` of `300px`.

			```js
			`assert.equal(new __helpers.CSSHelp(document).getStyle('.back-mountain')?.height, '300px');`
			```

			You should give `.back-mountain` a `background` of `linear-gradient(rgb(203, 241, 228), rgb(47, 170, 255))`.

			```js
			`assert.include(['linear-gradient(rgb(203,241,228),rgb(47,170,255))', 'rgba(0,0,0,0)linear-gradient(rgb(203,241,228),rgb(47,170,255))repeatscroll0%0%'], new __helpers.CSSHelp(document).getStyle('.back-mountain')?.getPropVal('background', true));`
			```

			`# --seed--`

			`## --seed-contents--`

			```html
			`<!DOCTYPE html>`
			`<html>`
			`<head>`
			`<meta charset="UTF-8" />`
test: enable tests for steps (#44550) * fix: handle missing solutions correctly Rather than creating an [[]] the parser now creates [] which isEmpty(). This makes the test suite check the next challenge for a solution. In addition, the logic for testing solutions was fixed. * chore: update snapshots * test: build new superblock in node.js-tests CI * test: allow forward slash in superblock slug * fix: borked tests oops * test: ignore duplicated projects * fix: i did not break these shaun did :) * fix: idIndex is index of id not id Co-authored-by: Nicholas Carrigan <nhcarrigan@gmail.com> 2021-12-22 20:18:06 +00:00			`<link rel="stylesheet" type="text/css" href="./styles.css" />`
chore(curriculum): standardise titles for rwd-beta (#45398) * chore(curriculum): accessibility-quiz * chore(curriculum): cafe-menu * chore(curriculum): ferris-wheel * chore(curriculum): fix ferris-wheel tests * chore(curriculum): colored-markers * chore(curriculum): photo-gallery * chore(curriculum): magazine * chore(curriculum): penguin * chore(curriculum): city-skyline * chore(curriculum): registration-form * chore(curriculum): picasso-painting * chore(curriculum): balance-sheet * chore(curriculum): piano * chore(curriculum): rothko-painting * fix: title min 15 chars 2022-03-14 15:54:43 +00:00			`<title>Penguin</title>`
feat(curriculum): add css-penguin practice project (#44214) * feat: add css-penguin practice project * rename block name * rename meta block * rename necessary properties * rename page * add to step 25 * adjust prototype with better structure/naming * add step adjusting .ground z-index * fix: add position: absolute to .ground * add to step 37 * add to step 103 * remove erm from solution * add tests to 001-020 * add tests 021-030 * test: update 012 to use dynamic hints * test: improve tests with dynamic hints * fix: add position:relative to .penguin * add tests 032-055 * add tests 056 - 103 * fix some tests * code blocks and test fixes Co-authored-by: Krzysztof G. <60067306+gikf@users.noreply.github.com> * allow 0% 0px 0 * fix: add width and height step for silly firefox * add instruction to add html element * Tom's good suggestions, and his American suggestions Co-authored-by: Tom <20648924+moT01@users.noreply.github.com> * adjust wording for - you guessed it - firefox Co-authored-by: Tom <20648924+moT01@users.noreply.github.com> * add missing calc keyword * just fix it with regex :( * apply Nich's probably bogus suggestions Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com> * remove duplicate Co-authored-by: Krzysztof G. <60067306+gikf@users.noreply.github.com> Co-authored-by: Tom <20648924+moT01@users.noreply.github.com> Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com> 2021-12-03 23:59:32 +00:00			`<meta name="viewport" content="width=device-width, initial-scale=1.0" />`
			`</head>`

			`<body>`
			`<div class="left-mountain"></div>`
			`<div class="back-mountain"></div>`
			`<div class="penguin"></div>`
			`<div class="ground"></div>`
			`</body>`
			`</html>`
			```

			```css
			`body {`
			`background: linear-gradient(45deg, rgb(118, 201, 255), rgb(247, 255, 222));`
			`margin: 0;`
			`padding: 0;`
			`width: 100%;`
			`height: 100vh;`
			`overflow: clip;`
			`}`

			`.left-mountain {`
			`width: 300px;`
			`height: 300px;`
			`background: linear-gradient(rgb(203, 241, 228), rgb(80, 183, 255));`
			`position: absolute;`
			`transform: skew(0deg, 44deg);`
			`z-index: 2;`
			`margin-top: 100px;`
			`}`

			`--fcc-editable-region--`

			`--fcc-editable-region--`

			`.penguin {`
			`width: 300px;`
			`height: 300px;`
			`margin: auto;`
			`margin-top: 75px;`
			`}`

			`.ground {`
			`width: 100vw;`
			`height: 400px;`
			`background: linear-gradient(90deg, rgb(88, 175, 236), rgb(182, 255, 255));`
			`z-index: 3;`
			`position: absolute;`
			`margin-top: -58px;`
			`}`
			```