CSS border radius allows you to curve the corners of page elements to give them a nice rounded effect without having to use images. Border radiuses can be applied to all corners or individually to each corner.
Here's an example of a 10px border radius for the top left corner:
The coveloping border radius generator tool allows you to apply separate border radiuses to each corner of a div element with easy to use sliders. The tool also features a 'styling' tab that allows you to make changes to the appearance of the div, namely the border, width, height and colours.
You can also adjust the background and border colour.
Border radius can be applied to a single corner or to all four and you can see a live preview of the changes you make to the element.
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