Custom Superior Panel on elementaryOS Luna - Lion Theme

apps.css

/*********
 * Panel *
 ********/

/* Paste this on file /usr/share/themes/Lion/gtk-3.0/apps.css */
.panel {
    background-color: alpha (#000, 0.0);
    color: #fff;
    font-weight: bold;
}

.panel-shadow {
    background-color: @transparent;
    background-image: -gtk-gradient (linear,
                     left top, left bottom,
                     from (alpha (#000, 0.0)),
                     to (alpha (#000, 0.0)));
}