input中css background-image

<img>的src屬性:  ./images/bg.png;

    background-image：url( ../images/bg.png  );
           

.user_name{
  position:absolute;
  left:50px;
  top:58px;
  width:301px;
  height:36px;
  border:0px;
  padding:0px;
  margin:0px;
  opacity:1.0;
  background-color:#FFFFFF;
  border-radius:3px;
  background-image: url(../images/Rectangle.png);
  background-repeat: no-repeat;
}