.header{
           position: fixed;
            top: 0;
            left: 0;
            background-color: rgba(0, 0, 0, 0.9);
            z-index: 9999;
        }
.banner{
    width: 100%;
}
.banner img{
    width: 100%;
    height: auto;
}
.detailbox{
   margin-top: 50px;
    width: 100%;
    display: flex;
    flex-direction: column;
   
    align-items: center;
}
.title{
    text-align: center;
    font-weight: bold;
    font-size: 24px;
    margin-bottom: 40px;
}
.detailbox img{
    width: auto;
    height: auto;
}