.whiteTransparentBackground
{
    background: rgb(255, 255, 255); /* The Fallback */
    background-color: rgba(255, 255, 255, 0.5); /* browsers */
}

.whitestTransparentBackground
{
    background: rgb(255, 255, 255); /* The Fallback */
    background-color: rgba(255, 255, 255, 0.8); /* browsers */
}