Why table align-v dont work?

[Ailton Silva]

  <b-table outlined small bordered responsive show-empty hover :items="items.data" :fields="fields"
          id="table" class=" text-center mt-2" >
             <template #cell(acoes)="data">
                    <div align-v="center" class="text-center"
                        style="width: 100%; height: 100px; background-color: rgba(134,255,2)">                    
                        <c-button :icon="['fas', 'eye']"
                            @click="detalhes(data.item)" tooltip="Detalhes" class="m-1" :size="'sm'" />
                        <c-button 
                            @click="descontoModal(data.item)" name="Desconto" class="m-1"
                            v-if="data.item.bloqueado == 0" :size="'sm'" />
                    </div>
                </template>
        </b-table>

[Hiws]

I'm not aware of div having a align-v attribute.
Did you mean to use a class?