Right aligned menus

[ghost]

Hi,

I have this:

    <header class="-navbar dev-navbar">
      <div class="-container">
        <div class="-row">
          <div class="-col1 _hidden-tables_ _hidden-phones_">
            <div class="-header"><a class="dev-logo" href="/">Activitatsd</a></div>
          </div>
          <nav id="mainmenu" class="-col5  _hidden-tablets_ _hidden-phones_" role="menu">
            <ul class="-menu -primary- _hovered_ _responsive_">
              <li><a>Accions</a>

Is it possible to align in the right the <nav id="mainmenu">? Something like _right_?
I just saw the -offset.