HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS input[name^=user_] Example</title>
  <style>
    input[name^="user_"] {
      border: 1px solid #93c5fd;
      background: #eff6ff;
      padding: 0.5rem;
      border-radius: 6px;
      width: 220px;
      font-size: 1rem;
    }

    label {
      display: block;
      margin-bottom: 0.35rem;
      font-weight: 600;
      color: #334155;
    }

    .field { margin-bottom: 1rem; }
  </style>
</head>
<body>
  <h1>User Profile</h1>
  <div class="field">
    <label for="user_name">Username</label>
    <input type="text" id="user_name" name="user_name" value="jane_doe">
  </div>
  <div class="field">
    <label for="user_email">Email</label>
    <input type="email" id="user_email" name="user_email" value="jane@example.com">
  </div>
  <div class="field">
    <label for="order_id">Order ID</label>
    <input type="text" id="order_id" name="order_id" value="ORD-123">
  </div>
</body>
</html>

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CSS [attribute^=value] - Input name Prefix