Is there way to create inset border radius with css3? (Without images)
I need a border radius like this:

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The best way I’ve found to achieve this with all CSS and HTML (no images, etc.) is by using CSS3 gradients, per Lea Verou. From her solution:
The net result is a set of transparent gradients with curves. See the full JSFiddle for a demo and to play around with the way it looks.
Obviously this depends on support for
rgbaandgradient, and accordingly should be treated as a progressive enhancement, or if it’s essential to the design, you should supply an image-based fallback for older browsers (especially IE, which doesn’t supportgradienteven up through IE9).