.file-input {
  position: relative;
  overflow: hidden;
  display: inline-block;
}
.file-input input[type=file] {
  position: absolute;
  top: 0; right: 0;
  min-width: 100%;
  min-height: 100%;
  font-size: 100px;
  text-align: right;
  filter: alpha(opacity=0);
  opacity: 0;
  outline: none;
  background: white;
  cursor: pointer;
  display: block;
}
#previewBox {
  border: 1px dashed #ccc;
  padding: 10px;
  text-align: center;
  background: #fafafa;
}
#previewImg {
  max-width: 100%;
  max-height: 260px;
}
.help-inline {
  color: #777;
  font-size: 12px;
}
.has-error .help-block { color: #a94442; }