fronend/scss/_jquerynestable.scss

.dd-handle {
    background-color: #f9f9f9 !important;

    &:hover {
        color: #2196F3;
    }
}

.nestable-dark-theme {
    .dd-handle {
        background: #ccc !important;
        border: 1px solid #999 !important;
    }
}

.dd3-handle {
    background: #999 !important;
}

.dd3-content {
    &:hover {
        color: #2196F3;
    }
}