#guides_horiz {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 100;
    height: 5px;
    overflow: hidden;
    width: 100%;
    background-color: #FF0000;
}

#guides_verti {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 101;
    width: 5px;
    overflow: hidden;
    height: 100%;
    background-color: #FF0000;
}