Web/CSS/border-radius

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.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

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:

• border-bottom-left-radius
• border-bottom-right-radius
• border-top-left-radius
• border-top-right-radius

Syntax

/* 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: 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	[[File:../../../../../media.prod.mdn.mozit.cloud/attachments/2012/07/09/3639/b42295f89e9a954ef185b95e1ffebc9e/all-corner.png|class=default internal|all-corner.png]]	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	[[File:../../../../../media.prod.mdn.mozit.cloud/attachments/2012/07/09/3642/20ed80936d423553bf797c61413a2932/top-left-bottom-right.png|class=default internal|top-left-bottom-right.png]]	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	[[File:../../../../../media.prod.mdn.mozit.cloud/attachments/2012/07/09/3644/adbf90a1e222497616b2faacf6c7e7f5/top-right-bottom-left.png|class=default internal|top-right-bottom-left.png]]	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	[[File:../../../../../media.prod.mdn.mozit.cloud/attachments/2012/07/09/3643/b9443d4aa8af00db73dc47c61c053b75/top-left.png|class=default internal|top-left.png]]	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	[[File:../../../../../media.prod.mdn.mozit.cloud/attachments/2012/07/09/3645/7181fe52c3c7d2c2224669def908b3c2/top-right.png|class=default internal|top-right.png]]	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	[[File:../../../../../media.prod.mdn.mozit.cloud/attachments/2012/07/09/3641/5567bf4331ba97df9e8e9d26226efc7f/bottom-rigth.png|class=default internal|bottom-rigth.png]]	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	[[File:../../../../../media.prod.mdn.mozit.cloud/attachments/2012/07/09/3640/f3015564bfd7439f3020bbc47d0dd04d/bottom-left.png|class=default internal|bottom-left.png]]	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.

<span id="<length>"><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.

<span id="<percentage>"><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:

border-radius: 1em/5em;

/* ... 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;

border-radius: 4px 3px 6px / 2px 4px;

/* ... 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 value	as each of the properties of the shorthand: border-top-left-radius: 0 border-top-right-radius: 0 border-bottom-right-radius: 0 border-bottom-left-radius: 0
Applies to	all 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.
Inherited	no
Percentages	refer to the corresponding dimension of the border box
Computed value	as each of the properties of the shorthand: border-bottom-left-radius: two absolute <length>s or <percentage>s border-bottom-right-radius: two absolute <length>s or <percentage>s border-top-left-radius: two absolute <length>s or <percentage>s border-top-right-radius: two absolute <length>s or <percentage>s
Animation type	as each of the properties of the shorthand: border-top-left-radius: a length, percentage or calc(); border-top-right-radius: a length, percentage or calc(); border-bottom-right-radius: a length, percentage or calc(); border-bottom-left-radius: a length, percentage or calc();

Formal syntax

<length-percentage>{1,4} [ / <length-percentage>{1,4} ]?where <length-percentage> = <length> | <percentage>

Examples

  border: solid 10px;
  /* the border will curve into a 'D' */
  border-radius: 10px 40px 40px 10px;

  border: groove 1em red;
  border-radius: 2em;

  background: gold;
  border: ridge gold;
  border-radius: 13em/3em;

  border: none;
  border-radius: 40px 10px;

  border: none;
  border-radius: 50%;

  border: dotted;
  border-width: 10px 4px;
  border-radius: 10px 40px;

  border: dashed;
  border-width: 2px 4px;
  border-radius: 40px;

Live Samples

• Sample 1 : http://jsfiddle.net/Tripad/qnGKj/2/
• Sample 2 : http://jsfiddle.net/Tripad/qnGKj/3/
• Sample 3 : http://jsfiddle.net/Tripad/qnGKj/4/
• Sample 4 : http://jsfiddle.net/Tripad/qnGKj/5/
• Sample 5 : http://jsfiddle.net/Tripad/qnGKj/6/

Specifications

Specification	Status	Comment
CSS Backgrounds and Borders Module Level 3The definition of 'border-radius' in that specification.	Candidate Recommendation	Initial definition

Browser compatibility

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
border-radius	Chrome Full support 4 Notes' Full support 4 Notes' Notes' Chrome ignores border-radius on <select> elements unless -webkit-appearance is overridden to an appropriate value. Full support 1 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	Edge Full support 12 Full support 12 Full support 12 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	Firefox Full support 4 Notes' Full support 4 Notes' Notes' Prior to Firefox 50, border styles of rounded corners (with border-radius) were always rendered as if border-style was solid. This has been fixed in Firefox 50. Notes' To conform to the CSS3 standard, Firefox 4 changes the handling of <percentage> values to match the specification. You can specify an ellipse as a border on an arbitrary sized element with border-radius: 50%;. Firefox 4 also makes rounded corners clip content and images if overflow: visible is not set. No support 1 — 12 Prefixed' Prefixed' Implemented with the vendor prefix: -moz-	IE Full support 9	Opera Full support 10.5 Notes' Full support 10.5 Notes' Notes' Before Opera 11.60, replaced elements with border-radius do not have rounded corners.	Safari Full support 5 Notes' Full support 5 Notes' Notes' Safari ignores border-radius on <select> elements unless -webkit-appearance is overridden to an appropriate value. Full support 3 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	WebView Android Full support ≤37 Full support ≤37 Full support 2 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	Chrome Android Full support 18	Firefox Android Full support 4 Notes' Full support 4 Notes' Notes' Prior to Firefox 50, border styles of rounded corners (with border-radius) were always rendered as if border-style was solid. This has been fixed in Firefox 50. No support 4 — 14 Prefixed' Prefixed' Implemented with the vendor prefix: -moz-	Opera Android Full support 11	Safari iOS Full support 4.2 Notes' Full support 4.2 Notes' Notes' Safari ignores border-radius on <select> elements unless -webkit-appearance is overridden to an appropriate value. Full support 1 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	Samsung Internet Android Full support 1.0
Elliptical borders	Chrome Full support 1 Notes' Full support 1 Notes' Notes' Before Chrome 4, the slash / notation is unsupported. If two values are specified, then an elliptical border is drawn on all four corners. -webkit-border-radius: 40px 10px; is equivalent to border-radius: 40px / 10px;.	Edge Full support 12	Firefox Full support 4	IE Full support 9	Opera Full support 10.5	Safari Full support 3 Notes' Full support 3 Notes' Notes' Before Safari 5, the slash / notation is unsupported. If two values are specified, then an elliptical border is drawn on all four corners. -webkit-border-radius: 40px 10px; is equivalent to border-radius: 40px / 10px;.	WebView Android Full support ≤37	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 11	Safari iOS Full support 4.2	Samsung Internet Android Full support 1.0
Percentages	Chrome Full support 8	Edge Full support 12	Firefox Full support 4 Notes' Full support 4 Notes' Notes' <percentage> values are implemented in a non-standard way prior to Firefox 4. Both horizontal and vertical radii were relative to the width of the border box.	IE Full support 9	Opera Full support 11.5 Notes' Full support 11.5 Notes' Notes' The implementation of <percentage> values was buggy in Opera prior to 11.50.	Safari Full support 5.1	WebView Android Full support ≤37	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 11.5	Safari iOS Full support 6	Samsung Internet Android Full support 1.0
4 values for 4 corners	Chrome Full support 4	Edge Full support 12	Firefox Full support 4	IE Full support 9	Opera Full support 10.5	Safari Full support 5	WebView Android Full support ≤37	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 11	Safari iOS Full support 4.2	Samsung Internet Android Full support 1.0

Legend

Full support  

Full support

See implementation notes.'

See implementation notes.

Requires a vendor prefix or different name for use.'

Requires a vendor prefix or different name for use.

See also

• Border-radius-related CSS properties: border-top-left-radius, border-top-right-radius, border-bottom-right-radius, border-bottom-left-radius

border-radius by Mozilla Contributors is licensed under CC-BY-SA 2.5.