a in center code example
Example: 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>