How can I achieve \'Inverted\' Border-Radius effects in CSS?

Alternatives to 'Inverted' Border-Radius

While CSS's native border-radius property doesn't allow for negative values, there are workarounds and alternative approaches to achieve similar effects.

CSS Solution:

One approach involves creating additional elements within the container, setting their background to match the page background, and positioning them just outside the main element. Then, apply border-radius to the outer elements to create the perceived effect of inverted corners.

Here's a CSS snippet demonstrating this technique:

<code class="css">#main {
  margin: 40px;
  height: 100px;
  background-color: #004C80;
  position: relative;
  overflow: hidden;
}

#main div {
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 100%;
  background-color: #FFF;
}

.top { top: -10px; }
.bottom { bottom: -10px; }
.left { left: -10px; }
.right { right: -10px; }</code>

Library-Based Approach:

If desired, you could utilize external libraries specifically designed to handle this functionality, such as:

• [negative-border-radius](https://github.com/filamentgroup/negative-border-radius)
• [Border Curves](https://github.com/4dreplay/border-curves)
• [css-corners](https://github.com/jonschlinkert/css-corners)

These libraries typically extend CSS capabilities and provide additional options for customizing border effects, including inverted corners.

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