Removing Admin Bar from Any version of WordPress

I have studied a lot about removing this admin bar, but could not found any of the solution for 3.3 and advanced version. i am not a PHP coding , but even though i tried different code snippits. But at the end got a really easy way to do it so.

Do it if like to solve it by CSS.
what i have done is .

Hide the WPADMINBAR .. by display:none;

and shifted the wrap to 30 px Up ward , by top : -30px ;

You just need to add

<style>
#wpadminbar {display:none;}
.wp-admin {position: relative; top: -30px;}

</style>

in your index.php in wp-admin folder before
<div class=”wrap”>