<a href="images/portfolio/full/portfolio_3.png" class="fa fa-search mfp-image"></a> <a href="<?php the_post_thumbnail( 'full', array( 'class' => 'fa fa-search mfp-image' )); ?>"></a>
Sorry for posting my question without research too much as my question is already anserved on stack overflow
Viktorviktor
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