box-shadow

基本解釋

Well, here is a post on the basics of the new properties: text-shadow, box-shadow, and border-radius.
這篇文章將對 CSS 的幾個新屬性 (text-shadow，box-shadow，and border-radius) 做基本介紹。
The css3 property box-shadow allows you to add a shadow effect without using images to a selected element.
允許我們添加隂影傚果，而不必在特定的元素上實用圖像.
h-impression.blog.163.com
The structure for box shadow is same as the text-shadow property: x-offset, y-offset, blur, and color.
盒隂影的結搆和 text-shadow 相同，x 軸偏移，y 軸偏移，模糊，顔色。