tabview/assets/tabview.css

.yui3-tab-panel {
    display: none;
}

.yui3-tab-selected {
    background: yellow;
}

.yui3-tab-selected {
    background: yellow;
}

.yui3-tab-panel-selected {
    background: yellow;
    display: block;
}

.yui3-tab {
    display: inline-block;
    margin-right: 0.5em;
    zoom: 1;
};