#image_slider .input-group {
  flex-wrap: nowrap;
}

#image_slider .dropdown {
  flex: 0 0 auto;
  align-self: end;
}

#image_slider .custom-file-label,
#image_slider .custom-file-input,
#image_slider .custom-file {
  min-height: 39px;
  margin: 0;
}

#image_slider .custom-file .custom-file-label::after {
  line-height: 1.8;
}