Looking at the module content, typo.css does the styling for the testimonials module.
From scratch, create a custom module with the module class suffix “_hilite” and place the following html into the custom output section:
<blockquote class=”testimonial”><span class=”open”>At</span> id ut nunc Nullam Quisque Lorem congue metus volutpat mauris. <span class=”close”>Nulla.</span><span class=”author”><a href=”http://www.joomlart.com” target=”_blank” title=”Testimonial”>J.Frank</a></span></blockquote>
<blockquote class=”testimonial”><span class=”open”>Lacinia</span> justo Donec porttitor Mauris vel risus velit neque Vestibulum <span class=”close”>fames</span><span class=”author”><a href=”http://www.joomlart.com” target=”_blank” title=”Testimonial”>F.Thomas</a></span></blockquote>
<blockquote class=”testimonial”><span class=”open”>Lacinia</span> justo Donec porttitor. Justo Donec <span class=”close”>fames</span><span class=”author”><a href=”http://www.joomlart.com” target=”_blank” title=”Testimonial”>A.Landon</a></span></blockquote>
That should do it.