.m-bg {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-repeat: no-repeat;
    background-position: center center;
    -webkit-background-size: cover;
    background-size: cover;
    -webkit-transition: all .5s;
    -o-transition: all .5s;
    transition: all .5s;
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);}
.s4-tintro {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    background: rgba(4, 0, 0, 0.4);
    text-align: center;}
.s4-tintro h3 {
    padding: 0 10px;
    font-size: 18px;
    color: #fff;
    line-height: 70px;
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
    word-break: break-all;
    transition: all 0.3s;
    position: relative;
    top: 0;}.m-bg {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-repeat: no-repeat;
    background-position: center center;
    -webkit-background-size: cover;
    background-size: cover;
    -webkit-transition: all .5s;
    -o-transition: all .5s;
    transition: all .5s;
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);}
.s4-tintro {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    background: rgba(4, 0, 0, 0.4);
    text-align: center;}
.s4-tintro h3 {
    padding: 0 10px;
    font-size: 18px;
    color: #fff;
    line-height: 70px;
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
    word-break: break-all;
    transition: all 0.3s;
    position: relative;
    top: 0;}.fengcai{width:30%; float:left;}
.fengcai img{width:100%; height:100px;}

@media only screen and (max-width: 900px) {
  .fengcai img{width:100%; height:70px;}
}