body{
  display: block;
  width: 100%;
  overflow-x: hidden;
}
.banner {
    padding-top: 200px; 
    width: 63%;
    height: 412px;
    margin: 0 auto;
    position: relative;
    margin-top: 90px;
}
.operation_group{
    position: absolute;
    top: 0;
    left: 50%;
}
.operation_group > li{
    padding: 10px 15px;
    margin-right: 30px;
    float: left;
    border: 1px solid #e5e5e5;
    cursor: pointer;
    -webkit-transition: all .5s;
     -o-transition: all .5s;
     transition: all .5s; 
}
.operation_group > li:hover{
    color: #fff;
    background-color: #000;
}
.img_team {
    position: absolute;
    top: 100px;
    left: 0;
    display: block;
    width: 100%;
    height: 100%;
    clear: both;
}

.team_list {
    float: left;
    margin-right: 40px;
}

.item_img{
    display: block;
    height: auto;
}
.btn_group{
    position: relative;
    top: 50%;
    margin-top: -100px;
    width: 100%;
}
.prev,
.next{
    position: absolute;
    display: block;
    width: 100px;
    height: 100px;
    cursor: pointer;
    -webkit-transition: all .5s;
     -o-transition: all .5s;
     transition: all .5s; 
    z-index: 998;
}
.prev{
    left: -180px;
    background: url(../iamges/btn_grounp.png) no-repeat;
    background-size: 100%;
    background-position-y: 0; 
}
.prev:hover{
    left: -210px;
}
.next{
    right: -180px;
    background: url(../iamges/btn_grounp.png) no-repeat;
    background-size: 100%;
    background-position-y: -100px;
}
.next:hover{
    right: -210px;
}
.active{
	color: #fff;
	background-color: #000;
}