#bjt {
position: relative;
margin: 2px auto;
width: 1300px;
height: auto;
text-align: left;
background: no-repeat top /100%;
}
.padtop{
padding-top: 300px;
}
.col-layout{width: 80%;height: auto;margin: 20px auto;}
.lm{margin: 0 auto;}
.lm1{height:600px;width: 72%;text-align: center;}
.lm1 div:first-child{height: 90%;}
.splm{width: 95%;margin-top: 100px;}
.splm>div{position: relative;z-index: 4;width: 32%;height: 320px;margin-bottom: 20px;}
.splm>div div:first-child{position: relative;z-index: 2;width: 100%; height: 285px;}
.splm>div div:nth-child(2){width: 100%; padding-top:5px;padding-bottom: 5px;}
.splm>div div:nth-child(3){position:absolute;z-index: 4;top:0; width: 100%;height: 100%;background: no-repeat center center ;}
.btn-play{position: absolute;display: block; width: 100%;height: 100%;}
.bottm{
height: 180px;
background: no-repeat top /100%;
text-align: center;
padding-top: 100px;
color: #ffffff;
}