* {
    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: 700;
    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: 700;
    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: 0;
    border: 0;
    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)
}