Edit This Code:
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $(":file").css("background-color", "red");
});
</script>
</head>
<body>

<form action="">
  Name: <input type="text" name="user"><br>
  File: <input type="file" name="myfile">
</form>

</body>
</html>


Result:
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