.sertificat_item {
    margin:0 5px;
}
.sertificat_item img {max-width:100%;}
.sertificat_item span.sertificat_text {
	display:block;
    margin-top:15px;
}

@media (min-width:768px) and (max-width:991px) {
    .sertificat_item {
        width:48%;
        vertical-align:top;
    }
}
@media (max-width:767px) {
    .sertificat_item {
        margin-bottom:15px;
    }
}