CSS: ghosted backelements

.backdotsleft{
    top: 0;
    left: -10em;
    background-image: url(../img/general/dots.png);
    background-size: 10em;
    background-repeat: no-repeat;
    border-radius: 3px;
    height: 10em;
    position: absolute;
    width: 10em;
}
.backdotscenter{
    top: 0;
    right: 0em;
    background-image: url(../img/general/dots.png);
    background-size: 10em;
    background-repeat: no-repeat;
    border-radius: 3px;
    height: 10em;
    position: absolute;
    width: 10em;
}