how to increase alert box size in webix?

I have a requirement to increase the size of alert box.but I have not found how to increase height and width.can you give the sample for that.
Example:–
webix.alert(“hi”);

Please check http://webix.com/snippet/eeb96398

webix.alert supports width and height settings, but they must be a full css size string, with px or some other unit.

thanks