.acd {
    width: 180px;
    height: 180px;

    background-color: #707070;
}

.acd .empty_diagram {
    position: absolute;
    top: 8px;
    left: 8px;
}

.acd .board {
    position: absolute;
    top: 10px;
    left: 10px;
    width: 160px;
    height: 160px;
}

.acd .caption {
    position: absolute;
    top: 80px;
    left: 0px;
    width: 180px;
    height: 20px;
    background-color: transparent;
    text-align: center;
    font: bold 12pt Tahoma;
}