.angular-ui-tree-empty {
    background-color: white;
    border-width: 0;
}

.angular-ui-tree-placeholder {
    background-color: #E6F1FC;
    border-color: #88b2d8;
    color: #88b2d8;
    float:left;
}

.angular-ui-tree-drag {
    float: left;
    opacity: .8;
}