.fdj {
  width: 100%;
  height: 100%;
  position: relative;
  cursor: move;
  }
  .small {
  margin:auto;
  width: 97%;
  height: 97%;

  }
  .small img {
    width: 100%;
  height: 100%;
  }
  .mask {
  width: 200px;
  height: 200px;
  background: rgba(255, 255, 0, 0.4);
  position: absolute;
  left: 0;
  top: 0;
  cursor: move;
  display: none;
  pointer-events: none;
  }
  .big {
  position: absolute;
  top: 35px;
  right: -40%;
  width: 40%;
  height: 364px;
  border: 1px solid gainsboro;
  overflow: hidden;
  display: none;
  z-index: 500;
  }
  .big img{
  position: absolute;
  left: 0;
  top: 0;
  }