Hey Guys ! i wanna a lil help !

The plugin is not the problem, the problem is that you don't know how to use CSS, and what you're looking for is a simple CSS like

.selected-tab {
background: #2196f3;
color: #FFF;
text-decoration: none;
border-radius: 2px;
}

.tabs {
background: #252525;
color: #B1B1B1;
text-decoration: none;
border-radius: 2px;
}

Add padding if you need to.