SOURCE

cola(function(model){
  //"direction", caption)
  
});

<c-tab id="tabControl" style="height: 100%;" direction="left">
    <nav>
        <tabs>
            <tab name="cola" caption="Cola" class="active" icon="setting"></tab>
            <tab name="dorado" caption="Dorado" closeable="true" icon="dashboard"></tab>
        </tabs>
    </nav>
    <contents>
        <content name="cola" class="active">
            Cola
        </content>
        <content name="dorado">
            Dorado
        </content>
    </contents>
</c-tab>

.ui.c-tab{
  background-color:#fff;
}