html, body {
    height: 100%;
    width: 100%;
    overflow: hidden;
    padding:0;
    margin:0;
  }

.three-box-title{
    position: relative;
    top: -200px;
    width: 300px;
    padding: 10px;
    height: 200px;
    background-color: rgba(18, 19, 18, 0.744);
}
.three-box-title-top h1{
    text-align: left;
    color: white;
    margin: 15px;
}
.three-box-title-top{
    display:flex;
    justify-content:flex-start;
}
.three-box-title p{
    margin: 15px;
    text-align: left;
    color: #c0c0c0;
    font-size: 18px;
}

/*取消列表的图标内容*/
/* ul{
    list-style: none;
} */
/*对整体部分的控制，浏览图片的窗口*/
.banner{
    width: 1624px;
    height: 500px;
    border: 2px solid #ccc;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
    background-color:#fff;
}
/*图片的初步设置后面的动态内容会在js中实现*/
.img{
    width:2860px;
    height: 500px;
    position: absolute;
    top: 0;
    left: 0;
}
/*让没长图片向左浮动*/
.img li{
    float: left;
}
/*圆点承载部分的设计*/
.num{
    position: absolute;
    bottom: 10px;
    width: 100%;
    text-align: center;
    font-size: 0;
}
/*圆点设计*/
.num li{
    width: 10px;
    height: 10px;
    background:rgba(0,0,0,0.5);
    border-radius: 100%;
    display: inline-block;
    margin: 0 5px;
    cursor: pointer;
}
/*按钮部分初始不可见*/
.btn{
    display: none;
}
/*按钮形状设计*/
.btn span{
    display: block;
    width: 50px;
    height: 100px;
    background: rgba(0,0,0,0.6);
    color: #fff;
    font-size: 40px;
    line-height: 100px;
    text-align: center;
    cursor:pointer;
}
/*上一个设计*/
.btn .prev{
    position: absolute;
    left: 0;
    top: 50%;
    margin-top: -50px;
}
/*下一个设计*/
.btn .next{
    position: absolute;
    right: 0;
    top: 50%;
    margin-top: -50px;
}
/*对按妞动态呈现的变换进行类选择器的设计为js代码部分进行铺垫*/
.num .active{
    background-color: #fff;
}
.hide{
    display: none;
}

.img li a img{
    height:500px;
}