Here is the code snippet in question:
<div id="button-wrapper">
<a id="matematica"></a><br>
<a id="romana">s</a><br>
<a id="informatica">s</a><br>
</div>
This is the CSS applied:
#matematica {
background-image:url('profile.jpg');
}
The issue is that the background image specified for 'matematica' doesn't seem to appear on the webpage. I have also tried adjusting the width and height properties of the anchor tag, but still no luck.