CSS: Round Corners

In modern browsers, it is easy to realize round corners for boxes or other elements without having to create complicated images for achieving this. Exemplary, we define two classes for corners with a radius of 3 pixels and 6 pixels:

.br3 { /* 3 pixel radius */
   -moz-border-radius: 3px;
   -webkit-border-radius: 3px;
   -khtml-border-radius: 3px;
   border-radius: 3px;
}
 
.br6  { /* 6 pixel radius */
   -moz-border-radius: 6px;
   -webkit-border-radius: 6px;
   -khtml-border-radius: 6px;
   border-radius: 6px;
}

The nice thing about this solution is that we now can assign the classes "br3" and "br6" to all elements that should have appropriate corners without having to write CSS rules for each element separately.

The following example shows a DIV-container with 6 pixels radius corners and an INPUT field with a corner radius of 3 pixels:

<div class="br6" id="box">
   <input name="inputfield" class="br3" value="">
</div>

Regarding compatibility: Modern browsers that support CSS3 already understand "border-radius" and thus can implement the corners. For older versions of Firefox, the rule with the -moz prefix is crucial, for Google Chrome and Safari, the property with the -webkit prefix. Older browsers not understanding anything of this, will display square corners instead of the rounded corners.