grid.css

/* TILES */
 
.tile
{
    position:absolute; /* relative already tried, not the desired effect */
    display:block;
    background-color: black;
    z-index:100;
}
 
.tile.ui-draggable
{
    /*outline: 10px white solid;*/
    z-index: 999;
}
 
.hitbox
{
    position:absolute;
    opacity:1;
    background-color:darkgray;
    height:100%;
    z-index: 102;
}
 
.handle
{
    position:absolute;
    left:0px;
    background-size: 100% 100%;
    z-index: 450;
}
 
.handle.handle-on
{
    background-image: url(../images/tiles/drag-handle-on.png);
}
.handle.handle-off
{
    background-image: url(../images/tiles/drag-handle-off.png);
}
.handle.handle-dragging
{
    background-image: url(../images/tiles/drag-handle-dragging.png);
}
 
.tile>iframe
{
    position:absolute;
    z-index: 101;
}