PHP：如何设置会话输出样式[关闭]

I have this PHP code:

<?php
session_start();
if (!empty($_SESSION['username'])) {
?>
    Welcome, <?= $_SESSION['username'] ?>
    <br>
    <a href='mcLogout.php'>Logout</a>
<?php
} else {
?>
    <p class="da">Don't have an account?</p>
    <p><a class="lr" href='registrationpage.php'>Register Here</a></p>
<?php
}
?>

The code is display the username of the user who is in the session (logged) and a link to log out. I wish to know how can I give a style to the username using CSS i.e:

"Welcome, <?=$_SESSION['username']?>"

This part of the code.

what ever comes between wihle echoing are just like any other HTML element.

<h1>" Welcome, " <?= $_SESSION['username'] ?></h1>

or

Welcome, <h1 class="username"><?= $_SESSION['username'] ?></h1>

you could just wrap it in <span> and do some CSS, like:

...
Welcome, <span class="username"><?=$_SESSION['username']?></span>
...

then css:

.username {
    color: #D2D8D9;
    font-weight: bold;
    ....
}

Just wrap your "Welcome part in a div"

<?php
session_start();
if (!empty($_SESSION['username'])) {
?>
    <div class="welcome-user">Welcome, <?= $_SESSION['username'] ?></div>
    <br>
    <a href='mcLogout.php'>Logout</a>
<?php
} else {
?>
    <p class="da">Don't have an account?</p>
    <p><a class="lr" href='registrationpage.php'>Register Here</a></p>
<?php
}
?>

You haven't have short tags <? ... ?> Turned on... I think... Try <?php ... ?> this will do... and instead of <?=$_SESSION['username']; ?> write <?php echo $_SESSION['username']; ?> This will work...