What could be causing the issue with thumbnails not enlarging in the gallery on a PHP-based website?

The issue with thumbnails not enlarging in the gallery on a PHP-based website could be due to a JavaScript error or a CSS styling issue. To solve this problem, ensure that the JavaScript code responsible for enlarging the thumbnails is functioning correctly and that the CSS styles are properly applied to the enlarged images.

// Check if the JavaScript code for enlarging thumbnails is included in the HTML file
// Make sure the CSS styles for the enlarged images are properly defined in the stylesheet
// Verify that the click event on the thumbnails triggers the JavaScript function to enlarge the image