CSS3 Rounded Corners.

With the CSS3 border-radius property, you can give any element "rounded corners".

Browser Support
The numbers in the table specify the first browser version that fully supports the property.

Numbers followed by -webkit- or -moz- specify the first version that worked with a prefix.

Property
border-radius 5.0
4.0 -webkit- 9.0 4.0
3.0 -moz- 5.0
3.1 -webkit- 10.5
CSS3 border-radius Property
With CSS3, you can give any element "rounded corners", by using the border-radius property.

Here are three examples:

1. Rounded corners for an element with a specified background color:

Rounded corners!

2. Rounded corners for an element with a border:

Rounded corners!

3. Rounded corners for an element with a background image:

Rounded corners!

Here is the code:

Example
#rcorners1 {
    border-radius: 25px;
    background: #73AD21;
    padding: 20px;
    width: 200px;
    height: 150px;
}

#rcorners2 {
    border-radius: 25px;
    border: 2px solid #73AD21;
    padding: 20px;
    width: 200px;
    height: 150px;
}

#rcorners3 {
    border-radius: 25px;
    background: url(paper.gif);
    background-position: left top;
    background-repeat: repeat;
    padding: 20px;
    width: 200px;
    height: 150px;
}
Note Tip: The border-radius property is actually a shorthand property for the border-top-left-radius, border-top-right-radius, border-bottom-right-radius and border-bottom-left-radius properties.
CSS3 border-radius - Specify Each Corner
If you specify only one value for the border-radius property, this radius will be applied to all 4 corners.

However, you can specify each corner separately if you wish. Here are the rules:

Four values: first value applies to top-left, second value applies to top-right, third value applies to bottom-right, and fourth value applies to bottom-left corner
Three values: first value applies to top-left, second value applies to top-right and bottom-left, and third value applies to bottom-right
Two values: first value applies to top-left and bottom-right corner, and the second value applies to top-right and bottom-left corner
One value: all four corners are rounded equally
Here are three examples:

1. Four values - border-radius: 15px 50px 30px 5px:



2. Three values - border-radius: 15px 50px 30px:



3. Two values - border-radius: 15px 50px:



Here is the code:

Example
#rcorners4 {
    border-radius: 15px 50px 30px 5px;
    background: #73AD21;
    padding: 20px;
    width: 200px;
    height: 150px;
}

#rcorners5 {
    border-radius: 15px 50px 30px;
    background: #73AD21;
    padding: 20px;
    width: 200px;
    height: 150px;
}

#rcorners6 {
    border-radius: 15px 50px;
    background: #73AD21;
    padding: 20px;
    width: 200px;
    height: 150px;
}
You could also create elliptical corners:

Example
#rcorners7 {
    border-radius: 50px/15px;
    background: #73AD21;
    padding: 20px;
    width: 200px;
    height: 150px;
}

#rcorners8 {
    border-radius: 15px/50px;
    background: #73AD21;
    padding: 20px;
    width: 200px;
    height: 150px;
}

#rcorners9 {
    border-radius: 50%;
    background: #73AD21;
    padding: 20px;
    width: 200px;
    height: 150px;
}







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