*{
    margin: 0;
    padding: 0;
}
.slide{
    max-width: 100%;
    height: auto;
    margin: 0 auto;
    position: relative;
    z-index: 999;
    overflow: hidden;
}
.slide ul{
    width: 10000%;
    list-style-type: none;
}
.next_btn{
    position: absolute;
    width: 25px;
    height: 26px;
    line-height: 26px;
    text-align: center;
    opacity: .5;
    vertical-align: middle;
    background: rgba(0,0,0);
    right: 5px;
    top: 50%;
    color: #fff;
    font-family: arial;
    font-size: 20px;
    font-weight: bold;
    display: inline-block;
    cursor: pointer;
    font-family: "宋体";
}
.prev_btn{
    position: absolute;
    width: 25px;
    height: 26px;
    line-height: 26px;
    text-align: center;
    opacity: .9;
    vertical-align: middle;
    background: rgba(0,0,0,.1);
    left: 5px;
    top: 50%;
    color: #fff;
    font-family: "宋体";
    font-size: 20px;
    font-weight: bold;
    display: inline-block;
    cursor: pointer;
}
.slide ul:after{
    content: '';
    clear: both;
    display: block;
}
.slide ul li{
    float: left;
    text-align: center;
}
.slide ul li img{
    vertical-align: middle;
    max-width: 100%;
}
.slide .circle_btn{
    position: absolute;
    bottom: 15px;
    text-align: center;
    left: 0;
    display: table;
    margin: 0 auto;
    width: 100%;
}
.slide .circle_btn button{
    box-sizing: content-box;
    opacity: .8;
    outline: none;
    border: none;
    padding: 2px 18px;
    background: rgba(255,255,255,.2);
    margin: 2px 5px;
    overflow: hidden;
    transition: all .6s;
    cursor: pointer;
}
.slide .circle_btn button.active{
    background: rgba(167,167,167,.8);
}