div.mainLinkContainerDiv
{
    text-align: center;
}

div.mainLink
{
    margin: 0px auto;
    width: 210px;
    height: 100px;
}

div.mainLink:hover
{
    -moz-opacity: .75;
    filter: alpha(opacity=75);
    opacity: .75;
    border: solid 1px blue;
    cursor: pointer;
}