Primefaces DataTable selectCheckboxMenu formatting filter problem

Question

I copied the Primeface showcase for the filters located here into my local JBoss installation: http://www.primefaces.org/showcase/ui/data/datatable/filter.xhtml But my selectCheckboxMenu for colors looks like this:

I am using Primefaces 5.0. How can I make it look like a demonstration on the PF Showcase website?

EDIT

Changed for PF 5.1.RC1, but still out of luck

Also tried increasing the width used by the demo for p: selectCheckboxMenu, but with this result

Answer 1

CSS, Primefaces.css

label {
    float: left;
    text-align: left;
    margin-right: 0.5em;
    display: block
}