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<!DOCTYPE html>
<html>
<head>
<style>
input:focus {
  background-color: yellow;
}
</style>
</head>
<body>
<form action="/action_page.php" method="get">
  First name: <input type="text" name="fname"><br><br>
  Last name: <input type="text" name="lname"><br><br>
  <input type="submit" value="Submit">
</form>
</body>
</html>