.btn.btn-file {
  position: relative;
  width: 120px;
  height: 35px;
  overflow: hidden;
}
.btn.btn-file > input[type='file'] {
  display: block !important;
  width: 100% !important;
  height: 35px !important;
  opacity: 0 !important;
  position: absolute;
  top: -10px;
  cursor: pointer;
}