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

# CSS shadows

{% tabs %}
{% tab title="⭐️ 重點" %}
{% hint style="info" %}

1. The [**box-shadow**](https://developer.mozilla.org/en-US/docs/Web/CSS/box-shadow) property represents the **light source's position** using **horizontal** and **vertical offsets**.
2. each shadow should use the **same ratio** between these two numbers.
3. As an element **gets closer** to the **user**, the **offset** should **increase** ⬆️, the **blur radius** should **increase** ⬆️, and the shadow's **opacity** should **decrease** ⬇️.
   {% endhint %}
   {% endtab %}

{% tab title="📘 手冊" %}

* MDN ⟩ 
  * [box-shadow](https://developer.mozilla.org/en-US/docs/Web/CSS/box-shadow)
  * [filter](https://developer.mozilla.org/en-US/docs/Web/CSS/filter-function): [drop-shadow()](https://developer.mozilla.org/en-US/docs/Web/CSS/filter-function/drop-shadow\(\))
    {% endtab %}

{% tab title="📗 參考" %}

* [ ] CSSTricks ⟩ [box-shadow](https://css-tricks.com/almanac/properties/b/box-shadow/)
* [ ] Josh Comeau ⟩ [Designing Beautiful Shadows in CSS](https://www.joshwcomeau.com/css/designing-shadows/) ❤️
* [ ] Tobias ⟩ [Smoother & sharper shadows with layered box-shadows](https://tobiasahlin.com/blog/layered-smooth-box-shadows/) ❤️
  {% endtab %}

{% tab title="🛠 工具" %}

* [Smooth Shadow](https://shadows.brumm.af/) ❤️
  {% endtab %}

{% tab title="Untitled" %}

* [shadows](/web/browser/canvas/state/shadow.md)
  {% endtab %}
  {% endtabs %}


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