body {
     font-family: Arial, sans-serif;
     margin: 0;
     padding: 0;
     background-color: #f7f7f7;
 }

 a,
 button {
     display: block;
     margin-bottom: 20px;
 }

 header {
     background-color: #333;
     color: #fff;
     text-align: center;
     padding: 20px 0;
     margin-bottom: 20px;
 }

 .container {
     max-width: 600px;
     margin: 0 auto;
     padding: 0 20px;
 }

 form,
 .centre {
     background-color: #fff;
     padding: 20px;
     border-radius: 5px;
     box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
     margin-bottom: 20px;
 }

 label {
     display: block;
     margin-bottom: 10px;
 }

 input[type="text"],
 input[type="password"],
 select {
     width: 100%;
     padding: 10px;
     margin-bottom: 20px;
     border: 1px solid #ccc;
     border-radius: 5px;
     box-sizing: border-box;
 }

 .btn {
     background-color: #333;
     color: #fff;
     border: none;
     padding: 10px 20px;
     border-radius: 5px;
     cursor: pointer;
 }

 .btn:hover {
     background-color: #555;
 }

 .pk {
     display: none;
 }