better.sass

// Main navigation elements
#Nav ul
  list-style: none
  margin: 10px 0 0 7px
  li
    display: inline
    a 
      list-style-type: none
      display: inline-block
      padding: 10px 20px
      color: #a1a1a1 
      background: #f4f4f4
      border: 1px solid #d1d1d1
      text-transform: uppercase
      +border-radius(4px)
      +box-shadow(#f1f1f1, 0, 1px, 3px)

notgood.css

/* Main navigation elements.
-------------------------------------------------------------- */
#Nav {height:45px;background:transparent}
#Nav ul {list-style:none;margin:10px 0 0 7px}
#Nav ul li {display:inline}
#Nav ul li a {list-style-type:none;display:inline-block;padding:10px 20px;color:#a1a1a1;background:#f4f4f4;border:1px solid #d1d1d1;text-transform:uppercase;-moz-border-radius:4px;-webkit-border-radius:4px;-moz-box-shadow:0 1px 3px #f1f1f1;-webkit-box-shadow:0 1px 3px #f1f1f1}