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# box-shadow
## 属性
* `inset`：阴影在盒子内部绘制，并在内容之上
* `offset-x`
* `offset-y`
* `blur-radius`
* `spread-radius`
* `color`
## 偏移
偏移是阴影相对于本体的相对位置
```markup
阴影右偏移
```
## 模糊距离：`blur-radius`
使用[**高斯模糊**](/notes/gaussian-blur.md)模糊阴影，阴影是元素的复制（阴影会继承元素的`border-radius`属性）
```markup
阴影右偏移，并模糊了
```
## 阴影大小：`spread-radius`
默认阴影大小等于元素大小，正数阴影变大 负数阴影变小
```markup
阴影完全偏移出来
```
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