    .#{$prefix}tree-drop-ok-append .#{$prefix}dd-drop-icon {
        background-image: theme-background-image('tree/drop-append');
    }

    .#{$prefix}tree-drop-ok-above .#{$prefix}dd-drop-icon {
        background-image: theme-background-image('tree/drop-above');
    }

    .#{$prefix}tree-drop-ok-below .#{$prefix}dd-drop-icon {
        background-image: theme-background-image('tree/drop-below');
    }

    .#{$prefix}tree-drop-ok-between .#{$prefix}dd-drop-icon {
        background-image: theme-background-image('tree/drop-between');
    }

    .#{$prefix}tree-ddindicator {
        height: 1px;
        border-width: 1px 0px 0px;
        border-style: dotted;
        border-color: green;
    }