CSS3 box shadow box-shadow_html/css_WEB-ITnose
Explanation from W3CSchool
Syntax:
box-shadow: h-shadow v-shadow blur spread color inset;
Note: box-shadow adds one or more shadows to the box. This property is a comma-separated list of shadows, each shadow specified by 2-4 length values, an optional color value, and the optional inset keyword. The value for omitted length is 0.
h-shadow | 必需。水平阴影的位置。允许负值。 |
v-shadow | 必需。垂直阴影的位置。允许负值。 |
blur | 可选。模糊距离。 |
spread | 可选。阴影的尺寸。 |
color | 可选。阴影的颜色。请参阅 CSS 颜色值。 |
inset | 可选。将外部阴影 (outset) 改为内部阴影。 |
example
1. box-shadow:10px 10px black;
2. box-shadow:10px -10px black;

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