<div class="file btn btn-lg btn-primary">
							Upload
							<input type="file" name="file"/>
						</div>
div {
  position: relative;
  overflow: hidden;
}
input {
  position: absolute;
  font-size: 50px;
  opacity: 0;
  right: 0;
  top: 0;
}

External CSS

  1. https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css

External JavaScript

This Pen doesn't use any external JavaScript resources.