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<!DOCTYPE html>
<html>
<head>
<style> 
input {
    width: 100%;
}
</style>
</head>
<body>

<p>A full-width input field:</p>

<form>
  <label for="fname">First Name</label>
  <input type="text" id="fname" name="fname">
</form>

</body>
</html>