Div con multiples imagenes de fondo


      .multi {
        background-image: url(img/1.png) , url(img/2.png) , url(img/3.png) , url(img/4.png); 
        background-repeat: no-repeat, no-repeat, no-repeat, no-repeat;
        background-position: top, bottom, right, left;
        width: 100%;
        height: 600px;
        -webkit-border-radius: 30px;
        -moz-border-radius: 30px;
        border-radius: 30px;
        -webkit-box-shadow: 7px 7px 5px 0px rgba(50, 50, 50, 0.75);
        -moz-box-shadow:    7px 7px 5px 0px rgba(50, 50, 50, 0.75);
        box-shadow:         7px 7px 5px 0px rgba(50, 50, 50, 0.75);
      }