.pkp_structure_head:before {
    z-index: -1;
    opacity: 0.24;
    box-shadow: inset 8px 3px 20px 1px rgba(0, 0, 0, 0.75);
    border: 1px solid #9a9a9a;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
}

.pkp_block.block_make_submission.pkp_block .content {
    text-align: center;
    padding: 10px;
}


#customblock-visitors .content {
    text-align: center;
}