Royal Slider Different Color Thumbnails

Royal Slider Different Color Thumbnails

I am trying to change the color of each thumbnail below the slider on the
wordpress royal slider plugin. At the moment they are all the same color.
Here is my HTML markup
<div class="rsTmb">
{{html}}
</div>
And here is the html code from each off my slides
<a class="rsImg" href="imageurl.png" data-
rsVideo="videorul">title goes here</a>
<div class="rsTmb" style="background:#108FD2">title goes here</div>
Can someone help me have set it up so that i have individual colors for
each off the tabs