# Animation Timing Function ## `ease-*`
Class Styles
`ease-linear` ```css animation-timing-function: linear; ```
`ease-in` ```css animation-timing-function: var(--ease-in); /* cubic-bezier(0.4, 0, 1, 1) */ ```
`ease-out` ```css animation-timing-function: var(--ease-out); /* cubic-bezier(0, 0, 0.2, 1) */ ```
`ease-in-out` ```css animation-timing-function: var(--ease-in-out); /* cubic-bezier(0.4, 0, 0.2, 1) */ ```
`ease-initial` ```css animation-timing-function: initial; ```
`ease-()` ```css animation-timing-function: var(); ```
`ease-[]` ```css animation-timing-function: ; ```
> [!NOTE] > This utility is not defined in `tw-animate-css` and is included only for completeness. It uses the `--tw-ease` variable to apply the timing function. Check out the [Tailwind CSS documentation][TailwindCSS_Easing] to see the actual implementation. [TailwindCSS_Easing]: https://tailwindcss.com/docs/transition-timing-function