#header-image:after {
display: none;
content: “”;
/* background: url(../images/overlay.png) repeat; */
top: 0;
left: 0;
bottom: 0;
right: 0;
position: absolute;
z-index: 1;
border-bottom: solid 9px #000000;
}
You have to delete the file “images/overlay.png ” or move it to a different folder and the grid is removed. This theme has come issues to put it mildly.