The other site didn’t load up properly so I couldn’t see the example you were referring to.
If you want the slider area to be full width, then you can take a look around line 2583 in your css file for this –
.slider-inner {
margin: 0 auto !important;
overflow: hidden;
padding: 0 !important;
width: 1280px;
}
and you can make your adjustments to the width.