Answers for "how to align an element vertically to the center of div in css"

css vertical align

.top-align {
	vertical-align: top;
}  

.center-align {
  	vertical-align: middle;
}

center a div

<div id="outer">
  <div id="inner">Foo foo</div>
</div>
//css:, demo with border
<style>
#inner {
  display: table;
  margin: 0 auto;
  border: 1px solid black;
}

#outer {
  border: 1px solid red;
  width:100%
}
</style>