How can I create the following html/css style (rounded corners, basic background-color) highlighted in red box:

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Use the
border-radiusCSS property to create rounded borders:You can leave out the prefixes, because Firefox 3.6 or old webkit browsers are almost extinct.
Although it’s possible to get rounded corners in OldIE (IE8-) using divs+images or PIE.htc, I recommend against it: PIE is not very reliable, and adding several HTML hacks just to get something to work in old IE is a waste.
See also: MDN:
border-radius.