CNG/WebRoot/css/easyui/themes/gray/filebox.css

.filebox .textbox-value {
  vertical-align: top;
  position: absolute;
  top: 0;
  left: -5000px;
}
.filebox-label {
  display: inline-block;
  position: absolute;
  width: 100%;
  height: 100%;
  cursor: pointer;
  left: 0;
  top: 0;
  z-index: 10;
}
.l-btn-disabled .filebox-label {
  cursor: default;
}