[Plugin: Breadcrumb NavXT] Middle links in breadcrumb have wrong background

I am using WP 3.7.1 and the Graphene theme. I installed the Breadcrumb NavXT plugin and I noticed that the middle links in the breadcrumb have a different background color than the first and last links. You can see an example here: http://www.bawiki.com/wiki/concepts/stakeholders/stakeholder-management/

I tried changing the background color using this CSS code but it does not seem to be working.

.breadcrumbs{
font-size: 1.3em;
color: #0a0000;
background: #e3e3e3 !strong;
margin: 30px 0 0 10px;
position: relative;
float: left; }

Does anyone have any suggestions? Thanks