.moduletable {
    position: relative; /* so ::before can position itself */
    z-index: 0; /* keep content above overlay */
    overflow: hidden; /* prevent overlay spill */
}

.moduletable::before {
   background-image: url('/tom/templates/ja_donate/images/mask.png');
    background-size: 100% 100%;
    background-repeat: no-repeat;
    background-position: center;
    background-blend-mode: multiply; /* blends color with image */
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    z-index: -1; /* keeps overlay behind the text/content */
}