Single Item Template - breaks styling

I've noticed that when I click an individual blog post (whether it auto-generates a page, or uses a page I've created), my menu styling is overwritten by a Telerik Resource.  This line in particular:

.topnav .k-state-hover background-color: #0fa1d5; border-color:white;

 I can add !important and this stops the CSS getting overridden, but that creates another problem because then:

.topnav .k-state-border-down background-color: #0fa1d5

gets overridden as well? 

Is this a known issue?