tabview/assets/tabview-core.css

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

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

.yui3-tabview-list,
.yui3-tab {
    margin:0;
    padding:0;
    list-style:none;
}

.yui3-tabview {
    position:relative; /* contain absolute positioned tabs (left/right) */
}

.yui3-tabview,
.yui3-tabview-list,
.yui3-tabview-panel,
.yui3-tab,
.yui3-tab-panel { /* IE: kill space between horizontal tabs */
    zoom:1;
}

.yui3-tab {
    display:inline-block;
    *display:inline; /* IE */
    vertical-align:bottom; /* safari: for overlap */
    cursor:pointer;
}

.yui3-tab-label {
    display:block;
    display:inline-block;
    padding: 6px 10px;
    position:relative; /* IE: to allow overlap */
    text-decoration: none;
    vertical-align:bottom; /* safari: for overlap */
}