.container{
   width:640px;
   height:300px;
   padding:5px;
   -webkit-box-sizing:border-box;
   -moz-box-sizing:border-box;
   box-sizing:border-box;
}
.slider_wrapper{
   overflow: hidden;
   position:relative;
   height:280px;
   top:auto;
}
#image_slider{

   position: relative;
   height: auto;
   list-style: none;
   overflow: hidden;
   float: left;
   /*Chrom default padding for ul is 40px */
   padding:0px;
   margin:0px;
}
#image_slider li{
   position: relative;
   float: left;
}
.nvgt{
   position:absolute;
   top: 120px;
   height: 50px;
   width: 30px;
   opacity: 0.6;
}
.nvgt:hover{
   opacity: 0.9;
}
#prev{
   background: #000 url('https://dl.dropboxusercontent.com/u/65639888/image/prev.png') no-repeat center;
   left: 0px;
}
#next{
   background: #000 url('https://dl.dropboxusercontent.com/u/65639888/image/next.png') no-repeat center;
   right: 0px;
}