div.caption {
          margin:0;
          padding:0;
          position:relative;
        }
        div.caption p {
          background:#000;
          top:0;
          color:#fff;
          font-size:0.9em;
          left:0;
          margin:0;
          opacity:0.7;
          padding:2px;
          position:absolute;
        }
        div.caption img {
          margin:0;
          padding:0;
        }