freeCodeCamp/guide/english/certifications/responsive-web-design/applied-visual-design/modify-fill-mode-of-an-animation/index.md

---
title: Modify Fill Mode of an Animation
---
## Modify Fill Mode of an Animation

### Solution

```html
<style>
  button {
    border-radius: 5px;
    color: white;
    background-color: #0F5897;
    padding: 5px 10px 8px 10px;
  }
  button:hover {
    animation-name: background-color;
    animation-duration: 500ms;
    animation-fill-mode: forwards;
  }
  @keyframes background-color {
    100% {
      background-color: #4791d0;
    }
  }
</style>
<button>Register</button>
```