CSS3 Rounded Corners

CSS3 Rounded Corners is a feature in CSS3 that allows you to create elements with rounded corners without the use of images or other hacks. It is done using the border-radius property and can be used to create elements with a variety of different shapes and sizes.

Prior to the introduction of this property in CSS3, creating rounded corners required the use of images or complex CSS hacks. With CSS3, developers can easily create rounded corners using just a few lines of code.

The syntax for creating rounded corners in CSS3 is:

border-radius: value;

The border-radius property can take one or two values, which correspond to the horizontal and vertical radii of the corner curves. For example, to create a div element with rounded corners of 10 pixels, you would use the following CSS:

div {
  border-radius: 10px;
}

You can also specify different values for the horizontal and vertical radii, to create more complex shapes. For example:

div {
  border-radius: 20px 10px;
}

div {
  border-top-left-radius: 20px;
  border-top-right-radius: 10px;
  border-bottom-right-radius: 5px;
  border-bottom-left-radius: 15px;
}