border-radius

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The border-radius CSS property rounds the corners of an element's outer border edge. You can set a single radius to make circular corners, or two radii to make elliptical corners.

Try it

The radius applies to the whole background, even if the element has no border; the exact position of the clipping is defined by the background-clip property.

The border-radius property does not apply to table elements when border-collapse is collapse.

Note: As with any shorthand property, individual sub-properties cannot inherit, such as in border-radius:0 0 inherit inherit, which would partially override existing definitions. Instead, the individual longhand properties have to be used.

Constituent properties

This property is a shorthand for the following CSS properties:

Syntax

css
/* The syntax of the first radius allows one to four values */
/* Radius is set for all 4 sides */
border-radius: 10px;

/* top-left-and-bottom-right | top-right-and-bottom-left */
border-radius: 10px 5%;

/* top-left | top-right-and-bottom-left | bottom-right */
border-radius: 2px 4px 2px;

/* top-left | top-right | bottom-right | bottom-left */
border-radius: 1px 0 3px 4px;

/* The syntax of the second radius allows one to four values */
/* (first radius values) / radius */
border-radius: 10px / 20px;

/* (first radius values) / top-left-and-bottom-right | top-right-and-bottom-left */
border-radius: 10px 5% / 20px 30px;

/* (first radius values) / top-left | top-right-and-bottom-left | bottom-right */
border-radius: 10px 5px 2em / 20px 25px 30%;

/* (first radius values) / top-left | top-right | bottom-right | bottom-left */
border-radius: 10px 5% / 20px 25em 30px 35em;

/* Global values */
border-radius: inherit;
border-radius: initial;
border-radius: revert;
border-radius: revert-layer;
border-radius: unset;

The border-radius property is specified as:

  • one, two, three, or four <length> or <percentage> values. This is used to set a single radius for the corners.
  • followed optionally by "/" and one, two, three, or four <length> or <percentage> values. This is used to set an additional radius, so you can have elliptical corners.

Values

radius A light blue rectangle with a light gray border. All 4 corners are rounded. Is a <length> or a <percentage> denoting a radius to use for the border in each corner of the border. It is used only in the one-value syntax.
top-left-and-bottom-right A light blue rectangle with a light gray border. The 2 corners on the top left and the bottom right have are rounded. Is a <length> or a <percentage> denoting a radius to use for the border in the top-left and bottom-right corners of the element's box. It is used only in the two-value syntax.
top-right-and-bottom-left A light blue rectangle with a light gray border. The 2 corners on the top right and the bottom left are rounded. Is a <length> or a <percentage> denoting a radius to use for the border in the top-right and bottom-left corners of the element's box. It is used only in the two- and three-value syntaxes.
top-left A light blue rectangle with a light gray border. The corner on the top left is rounded. Is a <length> or a <percentage> denoting a radius to use for the border in the top-left corner of the element's box. It is used only in the three- and four-value syntaxes.
top-right A light blue rectangle with a light gray border. The corner on the top right is rounded. Is a <length> or a <percentage> denoting a radius to use for the border in the top-right corner of the element's box. It is used only in the four-value syntax.
bottom-right A light blue rectangle with a light gray border. The bottom right corner is rounded. Is a <length> or a <percentage> denoting a radius to use for the border in the bottom-right corner of the element's box. It is used only in the three- and four-value syntaxes.
bottom-left A light blue rectangle with a light gray border. The bottom left corner is rounded. Is a <length> or a <percentage> denoting a radius to use for the border in the bottom-left corner of the element's box. It is used only in the four-value syntax.
<length>

Denotes the size of the circle radius, or the semi-major and semi-minor axes of the ellipse, using length values. Negative values are invalid.

<percentage>

Denotes the size of the circle radius, or the semi-major and semi-minor axes of the ellipse, using percentage values. Percentages for the horizontal axis refer to the width of the box; percentages for the vertical axis refer to the height of the box. Negative values are invalid.

For example:

css
border-radius: 1em/5em;

/* It is equivalent to: */
border-top-left-radius: 1em 5em;
border-top-right-radius: 1em 5em;
border-bottom-right-radius: 1em 5em;
border-bottom-left-radius: 1em 5em;
css
border-radius: 4px 3px 6px / 2px 4px;

/* It is equivalent to: */
border-top-left-radius: 4px 2px;
border-top-right-radius: 3px 4px;
border-bottom-right-radius: 6px 2px;
border-bottom-left-radius: 3px 4px;

Formal definition

Initial valueas each of the properties of the shorthand:
Applies toall elements; but User Agents are not required to apply to table and inline-table elements when border-collapse is collapse. The behavior on internal table elements is undefined for the moment.. It also applies to ::first-letter.
Inheritedno
Percentagesrefer to the corresponding dimension of the border box
Computed valueas each of the properties of the shorthand:
Animation typeas each of the properties of the shorthand:

Formal syntax

border-radius = 
<length-percentage [0,∞]>{1,4} [ / <length-percentage [0,∞]>{1,4} ]?

<length-percentage> =
<length> |
<percentage>

Examples

Live Samples

Specifications

Specification
CSS Backgrounds and Borders Module Level 3
# border-radius

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
border-radius
4 values for 4 corners
Elliptical borders
Percentages

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
See implementation notes.
Requires a vendor prefix or different name for use.
Has more compatibility info.

See also