
I have a solution

Go to Semantic - Default display template
Edit Display
Search function showDisplayImage()
In the tabble replace <div align="center"> with <div align="center" class="img-shadow">
OLD:
<table border="0" cellspacing="0" cellpadding="0" width="100%">
<tr>
<td><h2 class='rsg2_display_name' align="center"><?php echo htmlspecialchars(stripslashes($item->title), ENT_QUOTES); ?></h2></td>
</tr>
<tr>
<td><div align="center">
NEW:
<table border="0" cellspacing="0" cellpadding="0" width="100%">
<tr>
<td><h2 class='rsg2_display_name' align="center"><?php echo htmlspecialchars(stripslashes($item->title), ENT_QUOTES); ?></h2></td>
</tr>
<tr>
<td><div align="center"
class="img-shadow">
Thanks brandon,
your example brought me on the solution.
Cheers, Andy