Change slider size

My slider on the homepage of my site is too big. I would like it to be about half the size that it currently is. Please help me figure this out http://opendoormultiservices.com/.

 

Paste this code in Custom CSS
Appearance > Theme Option > Styling Option > Custom CSS

Code:

.slides_container div.slide img {
width: 904px;
height: 303px;
}
.slides_container div.slide {
width: 911px;
height: 303px;
}
.slides_container {
width: 911px;
height: 303px;
}
#example {
width: 920px;
height: 303px;}
 
.slider-wrapper {
width: 950px;
height: 390px;
background: url(images/slide-shaddow.png) 20px 317px no-repeat;
}