div#visualGridContainer {
    width: 738px;
    height: 600px;
    margin-left: auto;
    margin-right: auto;
    border: 5px solid #dddddd;
    position: relative;
    display: none;
}

div#visualGridContainer > div#readyWaitContainer {
    position: absolute;
    width: 40px;
    height: 40px;
    margin-left: -20px;
    margin-top: -20px;
    top: 50%;
    left: 50%;
}

div#visualGridContainer > div#readyWaitContainer > img {
    height: 40px;
    width: 40px;
}

/* positioning of items in the visual world for the current trial:
 * for all elements: position: absolute in a position: relative container means
 * position is relative to container
 */
div#visualGridContainer > img.vw_trialimage {
    position: absolute;
    width: 246px;
    height: 200px;
}
/* top-left item */
[vw_pos="0"], [vw_pos='topleft'] {
    top: 0;
    left: 0;
}
/* top-center */
[vw_pos="1"], [vw_pos='topcenter'] {
    margin-left: -123px;
    top: 0;
    left: 50%;
}
/* top-right */
[vw_pos="2"], [vw_pos='topright'] {
    top:0;
    right:0;
}
/* mid-left */
[vw_pos="3"], [vw_pos='midleft'] {
    margin-top: -100px;
    top: 50%;
    left: 0;
}
/* mid-center */
[vw_pos="4"], [vw_pos='midcenter'] {
    margin-top: -100px;
    margin-left: -123px;
    top: 50%;
    left: 50%;
}
/* mid-right */
[vw_pos="5"], [vw_pos='midright'] {
    margin-top: -100px;
    top: 50%;
    right: 0;
}
/* bottom-left */
[vw_pos="6"], [vw_pos='bottomleft'] {
    bottom:0;
    left:0;
}
/* bottom-center */
[vw_pos="7"], [vw_pos='bottomcenter'] {
    margin-left: -100px;
    bottom: 0;
    left: 50%;
}
/* bottom-right */
[vw_pos="8"], [vw_pos='bottomright'] {
    bottom: 0;
    right: 0;
}

/* styling of familiarization images */
div#visualGridContainer > img.familiarizationImage {
    position: absolute;
    margin-left: -123px;
    margin-top: -100px;
    left: 50%;
    top: 50%;
    z-index: 1000;
}

div#visualGridContainer > div#familiarizationText {
    position: absolute;
    width: 246px;
    margin-left: -100px;
    left: 50%;
    top: 66%;
    padding-top: 20px;
    text-align: center;
    font-size: 40pt;
}

div#visualGridContainer > div#familiarizationInstructions {
    position: absolute;
    width: 100%;
    left: 0;
    top: 10%;
    text-align: center;
    font-size: 16pt;
}