Opens behind sidebar

You can open fbshare.css file and replace with below code:

.social-button-container {
    overflow: visible;
    clear: both;
}

.social-button {
    width: 300px;
    height: 25px;
}

.fb-like { z-index: 99999; }

.fbpdl {
    z-index: 99999 !important; width:300px;
    overflow: visible;
}

.fb-like span {
    z-index: 99999 !important; width:300px !important;
    overflow: visible;
}