source: Dev/trunk/src/client/dojox/treemap/themes/TreeMap.css

.dojoxTreeMap {
        background-color: #EBEADB;
        font-family: Geneva, Arial, Helvetica, sans-serif;
}

.dojoxTreeMapLeaf {
        border: 1px solid black;
        padding: 3px;
}

.dojoxTreeMapGroup {
}

.dojoxTreeMapGroupContent {
}

.dojoxTreeMapHeader {
        background-color: white;
        border: 1px solid black;
}

/* on desktop recent browsers you may prefer to use :hover pseudo-class instead
   of dojoxTreeMapHovered */

.dojoxTreeMapLeaf.dojoxTreeMapHovered {
        border-color: white;
}

.dojoxTreeMapGroup.dojoxTreeMapHovered {
}

.dojoxTreeMapSelected {
        border-color: red;
}

.dojoxTreeMapSelected:before {
        content: '';
        position: absolute;
        left: 0px;
        top: 0px;
        right: 0px;
        bottom: 0px;
        border: 3px dashed red;
        pointer-events: none;
        z-index: 20;
}

.dojoxTreeMapGroup.dojoxTreeMapSelected:before {
        content: '';
        position: absolute;
        left: 1px;
        top: 1px;
        right: 1px;
        bottom: 1px;
        border: 1px solid red;
        pointer-events: none;
        z-index: 20;
}

.dojoxTreeMapSelected:before {
        content: '';
        position: absolute;
        left: 0px;
        top: 0px;
        right: 0px;
        bottom: 0px;
        border: 2px dashed white;
        pointer-events: none;
        z-index: 20;
}

.dojoxTreeMapGroup.dojoxTreeMapSelected{
        border:2px dashed red;
}

.dj_iequircks .dojoxTreeMapIEHack.dojoxTreeMapSelected,
.dj_ie7 .dojoxTreeMapIEHack.dojoxTreeMapSelected + div,
.dj_ie8 .dojoxTreeMapIEHack.dojoxTreeMapSelected + div {
        border:  1px solid red;
        z-index: 20;
}