Need to add background images to slider with tabs

Hi, how can I place text over images in a slider using tabs?

The slider works fine right now, but when I try to add a div with a background image, the slider doesn't go. This is css without the text over the images:

[tabs slidertype="simple" auto="yes" fx="slide" autospeed="4000"][tab]
<h1 style="color: #cc0000; line-height: 18px; padding: 30px;">This is a Sample Headline Slider 1</h1>
Lorem ipsum dolor sit amet, consectetur.

<img class="aligncenter" alt="" src="http://lkdevelopment.prozymeproducts.com/Beta/wp-content/uploads/2013/07/Slider-Training1.jpg" width="960" height="550" />[/tab][tab]
<h1 style="color: #cc0000; line-height: 18px; padding: 30px;">This is a Sample Headline Slider 2</h1>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor.
<img class="alignnone" alt="" src="http://lkdevelopment.prozymeproducts.com/Beta/wp-content/uploads/2013/07/Slider-Home1.jpg" width="960" height="550" />[/tab][/tabs]

What can I do to make this work?

Thank you