animate font weight css

.weightGrow:hover {
    text-shadow:
    -1px -1px 0 #2DD785,
    1px -1px 0 #2DD785,
    -1px 1px 0 #2DD785,
    1px 1px 0 #2DD785;
    -webkit-transition: all .5s;
    -moz-transition: all .5s;
    -o-transition: all .5s;
    transition: all .5s;
}