* {
    margin: 0;
    padding: 0;
    outline: none;
}
#box {
    width: 400px;
    height: 400px;
    margin: 0 auto;
    border: 1px solid #ADADAD;
    border-radius: 15px;
    box-shadow: 1px 1px 1px #ADADAD;
    text-align: center;
    position: relative;
}
#box h3 {
    padding: 40px 0;
    font-size: 18px;
}
#box .img {
    width: 280px;
    height: 200px;
    margin: 0 auto;
    position: relative;
}
#box .img img {
    width: 100%;
    height: 100%;
}
#box .img .kuai {
    width: 50px;
    height: 50px;
    background-image: url(../img/01.jpg);
    background-repeat: no-repeat;
    background-size: 280px 200px;
    left: 0;
    position: absolute;
    opacity: 0;
    z-index: 10;
}
#box .img .kuai2 {
    top: 10px;
    left: 100px;
    position: absolute;
    width: 50px;
    height: 50px;
    background-color: white;
}
#box .slider {
    width: 280px;
    height: 30px;
    margin: 20px auto;
    background-color: #DDDDDD;
    border-radius: 10px;
    position: relative;
}
#box .slider .ming {
    width: 0px;
    height: 30px;
    margin: 10px auto;
    background-color: skyblue;
    top: -10px;
    left: 0;
    border-radius: 10px;
    position: absolute;
    color: white;
    font-weight: bold;
    line-height: 30px;
}
#box .slider button {
    z-index: 20;
    width: 45px;
    height: 45px;
    position: absolute;
    left: 0;
    top: -8px;
    background: white url(../img/yz.png) no-repeat;
    background-size: 100%;
    border-radius: 50%;
    border: 0;
}
.minbtn {
    width: 300px;
    height: 50px;
    margin: 30px auto;
    text-align: center;
    overflow: hidden;
    line-height: 50px;
}
.minbtn button {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: url(../img/sx.png) no-repeat;
    background-size: 100%;
    border: 0;
    float: left;
}
.minbtn span {
    line-height: 30px;
    float: left;
    height: 100%;
    text-indent: 1em;
    color: blueviolet;
    font-weight: bold;
}

#box{ background-color:#fff}
.kung {

  position: relative;     
  margin-top: calc(50vh - 200px);
  z-index: 10; ; 
}
 
 
.backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 5;
}