/**
 * The "superclass style" of all boxes.
 */
.box, .hitbox, .tempbox {
    position: absolute;
    border: thin solid black;
    text-align: center;
    margin: 3px;
}

/**
 * Style that indicates a highlighted box.
 */
.hitbox {
    border: thick double green;
    font-weight: bold;
    margin: 0;
}

/**
 * Style for a temporary box that is currently
 * being dragged.
 */
.tempbox {
    background-color: #eeeeee;
}