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

border-radius: 30px;

border-radius: 25% 10%;

border-radius: 10% 30% 50% 70%;

border-radius: 10% / 50%;

border-radius: 10px 100px / 120px;

border-radius: 50% 20% / 10% 40%;

<section class="default-example" id="default-example">   <div class="transition-all" id="example-element">     This is a box with rounded corners.   </div> </section>

#example-element {   width: 80%;   height: 80%;   display: flex;   justify-content: center;   flex-direction: column;   background-color: #5b6dcd;   color: white;   padding: 10px; }

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

A light blue rectangle with a light gray border. All 4 corners are rounded.

A light blue rectangle with a light gray border. The 2 corners on the top left and the bottom right have are rounded.

<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 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

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

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

Examples

<pre id="example-1">   border: solid 10px;   border-radius: 10px 40px 40px 10px; </pre>  <pre id="example-2">   border: groove 1em red;   border-radius: 2em; </pre>  <pre id="example-3">   background: gold;   border: ridge gold;   border-radius: 13em/3em; </pre>  <pre id="example-4">   border: none;   border-radius: 40px 10px;   background: gold; </pre>  <pre id="example-5">   border: none;   border-radius: 50%;   background: burlywood; </pre>  <pre id="example-6">   border: dotted;   border-width: 10px 4px;   border-radius: 10px 40px; </pre>  <pre id="example-7">   border: dashed;   border-width: 2px 4px;   border-radius: 40px; </pre>

pre {   margin: 20px;   padding: 20px;   width: 80%;   height: 80px; }  pre#example-1 {   border: solid 10px;   border-radius: 10px 40px 40px 10px; }  pre#example-2 {   border: groove 1em red;   border-radius: 2em; }  pre#example-3 {   background: gold;   border: ridge gold;   border-radius: 13em/3em; }  pre#example-4 {   border: none;   border-radius: 40px 10px;   background: gold; }  pre#example-5 {   border: none;   border-radius: 50%;   background: burlywood; }  pre#example-6 {   border: dotted;   border-width: 10px 4px;   border-radius: 10px 40px; }  pre#example-7 {   border: dashed;   border-width: 2px 4px;   border-radius: 40px; }

Live Samples

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

Specifications

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

radius		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		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		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		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		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		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		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.