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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <input type="text" class="back">
  <input type="text" class="back">
  <input type="text" class="back">
  <input type="text" class="back">
</body>
</html>
 
var input = document.querySelector( ".back" );
input.oninput = function() {
  if( input.value ) {
    input.style.background = "white";
  }
  else {
    input.style.background = "";
  }
}
Output 300px

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anonymouspro
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