Add this in your child theme’s style.css file:
.entry-content p, .slider_post_entry p, .entry-content ul, .entry-content ol, .comment-entry ol{
font-family:"Trebuchet MS";
}
If you haven’t created a child theme yet, the next update of the theme will allow you to enter custom CSS from the theme’s options page, eliminating the need to create a child theme for simple styling mods.