the issue is being caused by conflicting styles in the main.css file.
if you edit:
#wrapper {
margin: 0px auto;
padding: 0px;
width: 960px;
text-align: center;
border-right: 5px solid #969D85;
border-left: 5px solid #969C85;
z-index: 500;
overflow: hidden;
background-color: #FEFABA;
}
to:
#wrapper {
margin: 0px auto;
padding: 0px;
width: 960px;
text-align: center;
border-right: 5px solid #969D85;
border-left: 5px solid #969C85;
z-index: 500;
/*overflow: hidden;*/
background-color: #FEFABA;
}
you can begin to see the cart display area, you will need to troubleshoot the other styles in the main.css to find any remaining conflicting styles.