The slider macro currently does not support custom classes, but you
could use a class wrapper (here called "foo"):
{{foo{<<slider chkCookie [[tiddler]] "label »" "tooltip">>}}}
Then add something like this to your StyleSheet:
---------------
.foo .button {
display: block;
border: none;
font-weight: bold;
}
.sliderPanel {
margin-left: 1em;
}
---------------
HTH.
-- F.