.lm-main{
    width: 1200px;
    height: auto; 
    margin: 0 auto;
    margin-top: 17px;
    margin-bottom: 44px;
}
.lm-h3{
    width: 100%;
    height: 60px;
    line-height: 60px;
}
.lm-h3 h3{
    font-size: 22px;
    color:#a52596;
}
.lm-main ul li{
    width: 385.67px;
    height: 280px;
    margin-right: 20px;
    margin-bottom: 20px;
    position: relative;
}
.lm-main ul li:nth-child(3n){
    margin-right: 0px;
}
.lm-tm{
    width: 386.67px;
    height: 280px;
    background: url(tm.png) rgba(0, 0, 0, .6) no-repeat center center;
    position: absolute;
    top: 0;
    left: 0;
}