Loooking at your example I was able to apply the following CSS to the ul with the id of #featured1:
#featured1 {
width: 90%;
overflow: hidden;
padding-left: 10%;
}
Doing so you will need to move the timer in the upper right over a bit and also throw off the caption width. That is easily done with this css:
.orbit-container .orbit-timer {
right:70px;
}
.orbit-container .orbit-slides-container > * .orbit-caption {
width:90%;
}
This solution will make your slider images smaller so you may want to increase the width of .large-10 for this case.