w3 fileupload styling code example
Example: File Upload Button and display file javascript
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form>
<label for="file-upload" class="custom-file-upload">
<i class="fa fa-cloud-upload"></i> Upload Image
</label>
<input id="file-upload" name='upload_cont_img' type="file" style="display:none;">
</form>