Как убрать фон у input'а?

.dropZoneOverlay, 
.FileUpload { 
  width: 283px; 
  height: 71px; 
} 
 
.dropZoneOverlay { 
  border: dotted 1px; 
  font-family: cursive; 
  color: #7066fb; 
  position: absolute; 
  //background: red; 
  top: 0px; 
  text-align: center; 
} 
 
.FileUpload { 
  opacity: 0; 
  position: relative; 
  z-index: 1; 
}

<div class="dropZoneContainer"> 
  <input type="file" id="drop_zone" class="FileUpload" accept=".jpg,.png,.gif" onchange="handleFileSelect(this) " /> 
  <div class="dropZoneOverlay">Drag and drop your image <br />or<br />Click to add</div> 
</div>