#slider3 em{background-position: center top;display: block;
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    transition: all 0.3s ease 0s;
    -webkit-transition: all 0.3s ease 0s;}
    
   .embox1{
    height: 0;
    padding-bottom:322px;
    overflow: hidden;
    position: relative;}
/**组件样式*/