functions.php

<?php

add_action('wp_head', 'admin_bar_fix', 5);

function admin_bar_fix() {
  if( !is_admin() && is_admin_bar_showing() ) {
    remove_action( 'wp_head', '_admin_bar_bump_cb' );
    $output  = '<style type="text/css">'."\n\t";
    //$output .= 'body.admin-bar { padding-top: 28px; }'."\n";
    $output .= 'body.admin-bar .top-bar { margin-top: 28px; }'."\n";
    $output .= '</style>'."\n";
    echo $output;
  }
}