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Box Shadow |
Box Shadow
The box-shadow
property attaches one or more shadows to an element. It's an option that gives you the power to easily design wonderful shadow effects. It works just like the text-shadow
property in that they are both used to create a drop shadow, which will create a darker version of the element just behind it and slightly offset. Box shadows are a great way to elevate the visuals of your web page.
A box shadow can be described with several properties including:
- X and Y offset from the element
- blur and spread radius
- color
Syntax:
div {
box-shadow: none | [inset? && [ <offset-x> <offset-y> <blur-radius>? <spread-radius>? <color>? ] ]#
}
-
inset (default: none)
If not specified, the shadow is assumed to be a drop shadow (as if the box were raised above the content).
The presence of the inset
keyword changes the shadow to one inside the frame.
-
offset-x offset-y
These are two length
values to set the shadow offset. specifies the horizontal distance. Negative values place the shadow to the left of the element. offset-y
specifies the vertical distance. Negative values place the shadow above the element. See length
for possible units.
-
blur-radius (default: 0)
This is a third length
value. The larger this value, the bigger the blur, so the shadow becomes bigger and lighter. Negative values are not allowed. If not specified, it will be 0 (the shadow's edge is sharp).
-
spread-radius (default: 0)
This is a fourth value. Positive values will cause the shadow to expand and grow bigger, negative values will cause the shadow to shrink. If not specified, it will be 0 (the shadow will be the same size as the element).
-
color
This value is used to set the color of the shadow, usually defined with hex #000000
, rgba value rgba(55,89,88,0.8)
or rgb value rgb(55,89,88)
.
Extended
To maximize compatibility, it is recommended that you declare box shadow properties for moz-appearance
and webkit
, this extends the normal syntax to:
div{
box-shadow: none | [inset? && [ <offset-x> <offset-y> <blur-radius>? <spread-radius>? <color>? ] ]#
-moz-box-shadow: none | [inset? && [ <offset-x> <offset-y> <blur-radius>? <spread-radius>? <color>? ] ]#
-webkit-box-shadow: none | [inset? && [ <offset-x> <offset-y> <blur-radius>? <spread-radius>? <color>? ] ]#
}
However, this step can be ignored if it is creating confusion, as moz property and webkit property will only work in specific applications such as Firefox, and are not on a standards track.
Examples
Basic use
div {
width: 200px;
height: 50px;
background-color: #333;
box-shadow: 10px 10px 5px #ccc;
}
10px - offset-x 10px - offset-y 5px - blur #ccc - light gray color
It will display
Inside box shadow
div {
width: 200px;
height: 50px;
background-color: #333;
box-shadow: inset 10px 10px 5px #ccc;
}
It uses very similar code, but with inset value, which displays shadow inside the div element.
Multiple box shadows
div {
width: 200px;
height: 50px;
background-color: #333;
box-shadow: inset 10px 10px 5px #ccc, 10px 10px 5px #ccc;
}
You can combine the previous two pieces of box-shadows using a comma to get multiple box shadows on the same div
More Information
- Docs: MDN