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---
id: 6140dc5e13d0c81e7496f182
title: Step 17
challengeType: 0
dashedName: step-17
---
# --description--
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Ora devi definire come iniziare l'animazione. Per fare ciò, crea una regola `0%` all'interno della regola `@keyframes wheel` . Le proprietà impostate in questo selettore annidato verranno applicate applicheranno all'inizio dell'animazione.
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Ad esempio, ecco una regola del `12%` :
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```css
@keyframes freecodecamp {
12% {
color: green;
}
}
```
# --hints--
La regola `@keyframes wheel` dovrebbe avere un selettore `0%` .
```js
assert(new __helpers.CSSHelp(document).getCSSRules('keyframes')?.[0]?.cssRules?.[0]?.keyText === '0%');
```
# --seed--
## --seed-contents--
```html
<!DOCTYPE html>
< html >
< head >
< meta charset = "UTF-8" >
< title > Ferris Wheel< / title >
< link rel = "stylesheet" href = "./styles.css" >
< / head >
< body >
< div class = "wheel" >
< span class = "line" > < / span >
< span class = "line" > < / span >
< span class = "line" > < / span >
< span class = "line" > < / span >
< span class = "line" > < / span >
< span class = "line" > < / span >
< div class = "cabin" > < / div >
< div class = "cabin" > < / div >
< div class = "cabin" > < / div >
< div class = "cabin" > < / div >
< div class = "cabin" > < / div >
< div class = "cabin" > < / div >
< / div >
< / body >
< / html >
```
```css
.wheel {
border: 2px solid black;
border-radius: 50%;
margin-left: 50px;
position: absolute;
height: 55vw;
width: 55vw;
max-width: 500px;
max-height: 500px;
}
.line {
background-color: black;
width: 50%;
height: 2px;
position: absolute;
top: 50%;
left: 50%;
transform-origin: 0% 0%;
}
.line:nth-of-type(2) {
transform: rotate(60deg);
}
.line:nth-of-type(3) {
transform: rotate(120deg);
}
.line:nth-of-type(4) {
transform: rotate(180deg);
}
.line:nth-of-type(5) {
transform: rotate(240deg);
}
.line:nth-of-type(6) {
transform: rotate(300deg);
}
.cabin {
background-color: red;
width: 20%;
height: 20%;
position: absolute;
border: 2px solid;
transform-origin: 50% 0%;
}
.cabin:nth-of-type(1) {
right: -8.5%;
top: 50%;
}
.cabin:nth-of-type(2) {
right: 17%;
top: 93.5%;
}
.cabin:nth-of-type(3) {
right: 67%;
top: 93.5%;
}
.cabin:nth-of-type(4) {
left: -8.5%;
top: 50%;
}
.cabin:nth-of-type(5) {
left: 17%;
top: 7%;
}
.cabin:nth-of-type(6) {
right: 17%;
top: 7%;
}
--fcc-editable-region--
@keyframes wheel {
}
--fcc-editable-region--
```
