Decrease menu line-height

Hello,

I'd like to decrease line height of menu2. As using firebug inspect, i found this code below:

#menu2 li li, #menu2 li li li, #menu3 li li, #menu3 li li li {
    -moz-border-bottom-colors: none;
    -moz-border-left-colors: none;
    -moz-border-right-colors: none;
    -moz-border-top-colors: none;
    border-color: #d01818;
    border-image: none;
    border-style: solid;
    border-width: 0.1px 0.1px 0.1px 0;
    margin: 0 0 0 -1px;
}

Then i've decreased border-width from 1px to 0.1px but nothing changed. Is there anyway to decrease the line height smaller than currently?

My site: http://www.hivietnam.net/vi/

Thanks,
Tuan.