Imagine that you have this kind of code:
<h:form id="foo">
<h:selectOneRadio id="bar" value="#{...}">
...
</h:selectOneRadio>
...
Then, in your CSS, you can try to do that:
table#foo\:bar > td {
width: 42px;
}
or
table#foo\:bar > tr > td {
width: 42px;
}
or
table#foo\:bar td {
width: 42px;
}
(I don't remember exactly how the parent relationship in CSS work, that's why I suggest these three examples)
In CSS, it means affect a 42px width to all elements <td>
that have a <tr>
parent, which have a <table>
parent with the ID foo:bar