Hide WP Admin bar with CSS

<?php
add_action( 'wp_footer', 'hide_admin_bar_with_css' );
function hide_admin_bar_with_css(){
?>
<style>
    #wpadminbar{
        display:none;
    }

    html{
        margin-top: 0 !important;
    }
</style>
<?php
}
?>