.vcenter {position:absolute;left:50%;top:50%;
transform: translate(-50%,-50%);}
<div> <img src='xx' /> <div class="vcenter">center</div> </div>
.vcenter {position:absolute;left:50%;top:50%;
transform: translate(-50%,-50%);}
<div> <img src='xx' /> <div class="vcenter">center</div> </div>