center
<div class="v-d-flex v-content-center" >
<div></div>
<div></div>
<div></div>
</div>
align-content-center version
start
<div class="v-d-flex v-content-start" >
<div></div>
<div></div>
<div></div>
</div>
align-content-start version
end
<div class="v-d-flex v-content-end" >
<div></div>
<div></div>
<div></div>
</div>
align-content-end version