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CSS•Advanced Styling

CSS Rounded Corners

Overview

The CSS

Formula

border - radius property is used to create rounded corners for elements.

CSS border-radius Property

Formula

The border - radius property defines the radius of an element's corners.
This property can be applied to all elements with a background - color, a border, or a background - image.

Here are three examples:

Rounded corners for an element with a background color: Rounded corners!

Rounded corners for an element with a border: Rounded corners!

Rounded corners for an element with a background image: Rounded corners!

Here is the code:

Example

#div1 {
border-radius: 25px;
background-color: #73AD21;
padding: 20px;
width: 200px;
height: 150px;
}
#div2 {
border-radius: 25px;
border: 2px solid #73AD21;
padding: 20px;
width: 200px;
height: 150px;
}
#div3 {
border-radius: 25px;
background-image: url(paper.gif);
background-position: left top;

Formula

background - repeat:

repeat;
padding: 20px;

width:

200px;
height: 150px;
}

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.

Formula

CSS border - radius - Specify Each Corner
The border - radius property can have from one to four values. Here are the rules:
Four values - border - radius: 15px 50px 30px 5px;

(first value applies to top-left corner, second value applies to top-right corner, third value applies to bottom-right corner, and fourth value applies to bottom-left corner):

Formula

Three values - border - radius: 15px 50px 30px;

(first value applies to top-left corner, second value applies to top-right and bottom-left corners, and third value applies to bottom-right corner):

Formula

Two values - border - radius: 15px 50px;

(first value applies to top-left and bottom-right corners, and the second value applies to top-right and bottom-left corners):

Formula

One value - border - radius: 15px;

(the value applies to all four corners, which are rounded equally:

Here is the code:

Example

#div1 {
border-radius: 15px 50px 30px 5px; /* four values */
background: #04AA6D;
width: 200px;
height: 150px;
}
#div2 {
border-radius: 15px 50px 30px; /*

three values */

background: #04AA6D;
width: 200px;
height: 150px;
}
#div3 {
border-radius: 15px 50px; /* two values */
background: #04AA6D;
width: 200px;
height: 150px;
}
#div4 {
border-radius: 15px; /* one value */
background: #04AA6D;
width: 200px;
height: 150px;
}

CSS Elliptical and Circular Shapes

To create elliptical corners, you must specify two values for each radius, separated by a slash /. The first value defines the horizontal radius, and the second value defines the vertical radius. To create a oval shape (for a rectangular element), or to create a circular shape (for a square element) set border-radius to 50%.

Example

Create elliptical, oval and circular shapes:

#div1 {
border-radius: 70px / 30px;
background: #04AA6D;
width: 200px;
height: 150px;
}
#div2 {
border-radius: 15px / 50px;

background:

#04AA6D;
width: 200px;
height: 150px;
}
#div3 {
border-radius: 50%;
background: #04AA6D;
width: 200px;
height: 150px;
}
#div4 {
border-radius: 50%;
background: #04AA6D;
width: 200px;
height: 200px;
}