Cikonss are created in order to be pure CSS, responsive and cross-browser usable. By "cross-browser" I mean IE8 as well. This means that CSS2 is in use which leads to limited shapes (and icons) available.
Some of icons do have border-radius property but this is mainly for fine styling in browsers that supports this property. This doesn't effect in loosing the shape of the icon.
Include cikonss.css file in the head of your html file, like so:
Now you can simply choose out of 43 icons, 5 sizes and 3 variants. An icon is made of two
elements. Parent element defines:
Child element is the actual icon - available classes are in preview section. Mandatory code for an icon would look like this: