body{
    width: 1366px;
    height: 764px;
}
.bpb_bg{
    background-image: url('../image/bpb/bg.png');
    background-size: contain;
}
.bpb_title{
    background-image: url('../image/bpb/title.png');
    background-repeat: no-repeat;
    background-size: contain;
    height: 9%;
}
.bpb_content{
    position: relative;
    width: 100%;
    height: calc(91%-40px);
    color: #fff;
}