---
id: 6169ab1aaeb4cd1174def700
title: Step 27
challengeType: 0
dashedName: step-27
---

# --description--

Because the animation is on an infinite loop and the start and end colors are not the same, the transition appears jerky when it switches back to yellow from red. 

To start fixing this, remove the `background-color` from your `0%` selector.

# --hints--

Your `0%` selector should not have a `background-color` property.

```js
assert(!new __helpers.CSSHelp(document).getCSSRules('keyframes')?.[1]?.cssRules?.[0]?.style?.backgroundColor);
```

# --seed--

## --seed-contents--

```html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title> Learn CSS Animations by Building a 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;
  animation-name: wheel;
  animation-duration: 10s;
  animation-iteration-count: infinite;
  animation-timing-function: linear;
}

.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%;
  animation: cabins 10s ease-in-out infinite;
}

.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%;
}

@keyframes wheel {
   0% {
     transform: rotate(0deg);
   }
   100% {
     transform: rotate(360deg);
   }
}

--fcc-editable-region--
@keyframes cabins {
  0% {
    transform: rotate(0deg);
    background-color: yellow;
  }
  50% {
    background-color: purple;
  }
  100% {
    transform: rotate(-360deg);
  }
}
--fcc-editable-region--
```
