Highlight row and cell when the mouse hovers over them

<style type="text/css">
    tr:hover
    {
        opacity: 0.7;
        color: DarkRed;
        background-color: White;
    }
    td
    {
        padding-left: 1ex;
        padding-right: 1ex;
    }
    td:hover
    {
        opacity: 1.0;
        background-color: Gold;
    }
</style>