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feat: Update contents

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Phuoc Nguyen
2023-08-19 19:27:15 +07:00
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---
category: Display
created: '2021-05-09'
description: Create concave corners with CSS
keywords: css border radius, css concave border radius, css concave corners
thumbnail: /assets/css-layout/thumbnails/concave-corners.png
title: Concave corners
---
## HTML
```html
<div class="concave-corners">
<!-- The top-left corner -->
<div class="concave-corners__corner concave-corners__corner--tl"></div>
<!-- The top-right corner -->
<div class="concave-corners__corner concave-corners__corner--tr"></div>
<!-- The bottom-left corner -->
<div class="concave-corners__corner concave-corners__corner--bl"></div>
<!-- The bottom-right corner -->
<div class="concave-corners__corner concave-corners__corner--br"></div>
<!-- Content -->
...
</div>
```
## CSS
```css
.concave-corners {
background-color: #d1d5db;
/* Used to position the corners */
position: relative;
}
.concave-corners__corner {
/* Absolute position */
position: absolute;
/* Size */
height: 1rem;
width: 1rem;
background: #fff;
}
.concave-corners__corner--tl {
/* Position */
left: 0;
top: 0;
/* Border radius */
border-radius: 0 0 1rem 0;
}
.concave-corners__corner--tr {
/* Position */
right: 0;
top: 0;
/* Border radius */
border-radius: 0 0 0 1rem;
}
.concave-corners__corner--bl {
/* Position */
bottom: 0;
left: 0;
/* Border radius */
border-radius: 0 1rem 0 0;
}
.concave-corners__corner--br {
/* Position */
bottom: 0;
right: 0;
/* Border radius */
border-radius: 1rem 0 0 0;
}
```
<Playground>
```css styles.css hidden
body {
height: 24rem;
}
.concave-corners {
background-color: #d1d5db;
/* Used to position the corners */
position: relative;
/* Misc */
height: 100%;
width: 100%;
}
.concave-corners__corner {
/* Absolute position */
position: absolute;
/* Size */
height: 1rem;
width: 1rem;
background: #fff;
}
.concave-corners__corner--tl {
/* Position */
left: 0;
top: 0;
/* Border radius */
border-radius: 0 0 1rem 0;
}
.concave-corners__corner--tr {
/* Position */
right: 0;
top: 0;
/* Border radius */
border-radius: 0 0 0 1rem;
}
.concave-corners__corner--bl {
/* Position */
bottom: 0;
left: 0;
/* Border radius */
border-radius: 0 1rem 0 0;
}
.concave-corners__corner--br {
/* Position */
bottom: 0;
right: 0;
/* Border radius */
border-radius: 1rem 0 0 0;
}
```
```html index.html hidden
<div class="concave-corners">
<div class="concave-corners__corner concave-corners__corner--tl"></div>
<div class="concave-corners__corner concave-corners__corner--tr"></div>
<div class="concave-corners__corner concave-corners__corner--bl"></div>
<div class="concave-corners__corner concave-corners__corner--br"></div>
</div>
```
</Playground>