less css transition

.css3_gradient

.css3_gradient(@from, @to, @fallback: @to) {
    background-color:@fallback;
    background-image:-webkit-gradient(linear, left top, left bottom, from(@from), to(@to));
    background-image:-webkit-linear-gradient(top, @from, @to);
    background-image:-moz-linear-gradient(top, @from, @to);
    background-image:-ms-linear-gradient(top, @from, @to);
    background-image:-o-linear-gradient(top, @from, @to);
    background:linear-gradient(to left bottom, @from, @to);
}