The template itself has specific styling base upon classes that should be added to the particle.
These classes won't exist in Hydrogen so it's no good just adding them on the particle. So what you need to do is to replicate that styling by looking at the statements in Xenon and doing the equivalent in Hydrogen...
.g-newsslider-headlines {
background: rgba(18, 18, 18, 0.05) none repeat scroll 0 0;
border-left: 1px solid rgba(104, 104, 104, 0.5);
}
I can't do all the styling for you...
Regards, Mark.