.btn-file {
  position: relative;
  overflow: hidden;
  height: auto !important;
}
.btn-file label {
  margin-bottom: 0;
}
.btn-file label small {
  overflow: hidden;
  display: block;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding: 0 10px;
}
.btn-file 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: inherit;
  display: block;
}