.Centred, .Centered, .centred, .centered  { margin-left: auto; margin-right: auto; text-align:center; }

Center, center, Centre, centre
{
    margin-left: auto; margin-right: auto; text-align:center;
}

center table, centre div
{
    margin-left: auto; margin-right: auto;
}

.vcenter
{
    vertical-align:middle;
}