Một bài hướng dẫn CSS3 cơ bản với nhiều ví dụ mẫu CSS33 trực tiếp để giúp bạn hiểu rõ hơn về thuộc tính box-shadow.

• Demo
• Phóng to
• Tải lại
• Cửa sổ mới

---

Standard Shadow

.standard-shadow { box-shadow: 1px 1px 1px rgba(0,0,0,0.5); }

The above code would generate a shadow like this:

You have your first 2 values which give the horizontal and vertical offsets of the shadow, a third value which sets the amount of blur you want to apply and lastly a color (in which case we use an rgba() value for a half opacity black). Box-shadow is supported on every modern browser, but if you are so incredibly inclined, a -webkit and -moz prefix would come in handy for full support of those older browsers. Now, you may think "Oh, well that's nice. Now I can make a shadow, woohoo" but things aren't over just yet!

Glow

.glow-shadow { box-shadow: 0 0 5px 1px #09F; }

Look at that! We adjust the offset so that the "shadow" is basically centered on the element. We expanded the blur radius to 5px, added a new value to 1 px, that value being "spread". This gives a sort of extra "thickness" to the shadow.

Another Border

.border-shadow { box-shadow: 0 0 0 2px #F00; }

Keeping the 0 x and y offset, but lowering the blur to 0 will basically use the spread value as the thickness for an extra border! This can come in handy when an input has the wrong info, or you want to add a border to an element without affecting it's size and position (shadows, unlike borders, don't shift or add to an element's width).

Multiple Shadow

.multi-shadow { box-shadow: 0 0 5px 1px #09F, 0 0 0 2px #F00; }

Interestingly enough, one of the neat features of box-shadow is the ability to stack them! By separating each set of values with a comma, you can add multiple shadows to a single element. This technique has been used to make some crazy things.

Inset Shadow

.inset-shadow { box-shadow: inset 1px 1px 4px #000; }

Last, but not least, by adding an "inset" value before all our other values, we can have the shadow radiate from the inside (a la Photoshop's inner shadow/glow) instead of out. This effect comes in handy for a pressed button or to add an inner glow to an element.

And those are the basics of the box-shadow! There's still more you can do too; here are a few more fancy tricks you can do! In particular, there are extra examples of what that optional "spread" value can do.

• Mã nguồn
• In

• Lời bình (0)
• Viết

bởi Xem

Hủy phản hồi

Viết lời bình của bạn

Lời bình của khách sẽ được xem xét
Cung cấp email thật để nhận các trả lời, nếu không bình luận của bạn sẽ bị xóa

Tên bạn *
Email của bạn^g *
Website của bạn

Tiêu đề bình luận

Tôi khẳng định 100% là người thực
Tôi lặp lại tôi không phải là công cụ máy

• Lượt gửi (0)
• Mới