HTML Code

<!DOCTYPE html>



<html lang="en">



<head>



  <meta charset="utf-8">



  <title>input focus styling</title>



  <style>



    body { font-family: sans-serif; padding: 16px; max-width: 24rem; }



    label { display: block; margin: 10px 0; }



    input { width: 100%; padding: 8px; border: 2px solid #cbd5e1; border-radius: 6px; box-sizing: border-box; }



  </style>



</head>



<body>



  <label>First name <input type="text"></label>



  <label>Last name <input type="text"></label>



  <label>Email <input type="email"></label>



  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>



  <script>



    $("input").on("focus blur", function() {



      $("input:focus").css({



        borderColor: "#2563eb",



        boxShadow: "0 0 0 3px rgba(37, 99, 235, 0.25)"



      });



      $("input").not(":focus").css({



        borderColor: "#cbd5e1",



        boxShadow: "none"



      });



    });



  </script>



</body>



</html>

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input:focus — highlight active field (Try It)