CSS Resources
button over image:
<div class="img-wrapper">
<img class="img-responsive" src="your_image_goes_here">
<div class="img-overlay">
<button class="btn btn-md btn-success">Button</button>
</div>
</div>
.img-wrapper {
position: relative;
}
.img-overlay {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
text-align: center;
}