Try something like this:
.generate-sections-container {
-webkit-box-shadow: 10px 10px 5px 0px rgba(0,0,0,0.75);
-moz-box-shadow: 10px 10px 5px 0px rgba(0,0,0,0.75);
box-shadow: 10px 10px 5px 0px rgba(0,0,0,0.75);
}
You can modify the shadow using this cool site: http://www.cssmatic.com/box-shadow