tariel

<style>
#container { width:200px; height:200px; background-color:yellow; position:relative; }
  #content { left:50%; top:50%; transform:translate(-50%,-50%); -webkit-transform:translate(-50%,-50%); background-color:gray; color:white; position:absolute; }
</style>

<div id="container"><div id="content">Hello World</div></div>

tariel

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tariel

/* The wrapper */
.b-block {
    position: relative;

    display: inline-block;
    overflow: hidden;
    width: 10em;
    height: 10em;

    vertical-align: middle;