HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS :focus Form Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
    }

    label {
      display: block;
      margin-bottom: 0.25rem;
      font-weight: 600;
      font-size: 0.875rem;
      color: #334155;
    }

    input {
      display: block;
      width: 100%;
      max-width: 16rem;
      margin-bottom: 0.75rem;
      padding: 0.5rem 0.75rem;
      border: 1px solid #cbd5e1;
      border-radius: 0.4rem;
      font-size: 0.9375rem;
    }

    input:focus {
      outline: none;
      border: 2px solid #2563eb;
      background-color: #eff6ff;
    }

    button {
      padding: 0.6rem 1.2rem;
      background: #2563eb;
      color: #fff;
      border: none;
      border-radius: 0.5rem;
      font-weight: 600;
      cursor: pointer;
    }
  </style>
</head>
<body>
  <form>
    <label for="email">Email:</label>
    <input type="email" id="email" placeholder="Enter your email">

    <label for="password">Password:</label>
    <input type="password" id="password" placeholder="Enter your password">

    <button type="submit">Login</button>
  </form>
  <p><small>Tab into the fields to see :focus styling.</small></p>
</body>
</html>

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CSS :focus Selector - Form Inputs