> For the complete documentation index, see [llms.txt](https://freeseamew.gitbook.io/svelte/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://freeseamew.gitbook.io/svelte/5./untitled.md).

# 동적 css 적용방법

```
<script>
	let active
</script>

<style>
	.box {
		padding:10px;
		border: 1px solid #FF003A;
	}

	.checkBorder {
		border: 5px solid #FF003A;
	}
</style>

<input type="checkbox" bind:checked={active} /> boarder size

<p class="box" class:checkBorder={active}>
	Style Box
</p>
```

[\[만들면서 배우는 Svelte\]](https://www.inflearn.com/course/%EB%A7%8C%EB%93%A4%EB%A9%B4%EC%84%9C-%EB%B0%B0%EC%9A%B0%EB%8A%94-%EC%8A%A4%EB%B2%A8%ED%8A%B8)

<div align="left"><img src="https://2456181503-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MFoRG7N_kopXKHrUIam%2F-MGqndftNeXvP53tyaae%2F-MGqwZuQK1aEaE5Bp21i%2F%E1%84%86%E1%85%A1%E1%86%AB%E1%84%83%E1%85%B3%E1%86%AF%E1%84%86%E1%85%A7%E1%86%AB%E1%84%89%E1%85%A5%20%E1%84%87%E1%85%A2%E1%84%8B%E1%85%AE%E1%84%82%E1%85%B3%E1%86%AB%20svelte%20small.png?alt=media&amp;token=e769cba7-bb5e-40a9-89c6-2879e60242bf" alt="만들면서 배우는 svelte"></div>