SOLVED - font awesome rotate 45 degrees

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/font-awesome/3.0.2/css/font-awesome.css">
<i class="icon-arrow-up rotate-45-left"></i>
<i class="icon-arrow-up"></i>
<i class="icon-arrow-up rotate-45-right"></i>

CSS

.rotate-45-left:before {
    -o-transform: rotate(-45deg);
    -webkit-transform: rotate(-45deg);
    transform: rotate(-45deg);
}

.rotate-45-right:before {
    -o-transform: rotate(45deg);
    -webkit-transform: rotate(45deg);
    transform: rotate(45deg);
}

.hidden {
    visibility: hidden;
}