What potential issues can arise when trying to style a form using CSS classes in PHP?

When styling a form using CSS classes in PHP, potential issues can arise if the CSS classes are not properly applied to the form elements. To solve this, make sure to correctly reference the CSS classes in the HTML output of the form elements. Additionally, ensure that the CSS file containing the styles is properly linked to the PHP file. 

<form action="process_form.php" method="post">
    <label for="username">Username:</label>
    <input type="text" id="username" name="username" class="form-input">
    <label for="password">Password:</label>
    <input type="password" id="password" name="password" class="form-input">
    <input type="submit" value="Submit" class="form-button">
</form>

Keywords

CSS classes styling form PHP compatibility

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