register_user.php
form {
margin-top: 20px;
}
input[type="text"],
input[type="password"] {
width: 100%;
padding: 10px;
margin: 5px 0;
}
input[type="submit"] {
width: 100%;
padding: 10px;
background-color: #007BFF;
color: #fff;
border: none;
cursor: pointer;
}