html,
body {
position: relative;
height: 100%;
}
.prolunbo{
/* width: ; */
position: relative;
}
.prolunbo .arrow-left {
background: url(../img/productleft.png) no-repeat center;
position: absolute;
/* background-size: 100% 100%; */
left: 0px;
top: 50%;
margin-top: -15px;
width: 50px;
height: 55px;
}
.prolunbo .arrow-right {
background: url(../img/productright.png) no-repeat center;
position: absolute;
/* background-size: 100% 100%; */
right: -10px;
top: 50%;
margin-top: -15px;
width: 50px;
height: 55px;
}