#oncoprintDiv {
    .oncoprintjs__track_options__toggle_btn_img {
        top: 4px;
    }
    .oncoprintjs__track_options__toggle_btn_img,
    .oncoprintjs__header__toggle_btn_img {
        opacity: 0; // hide unless hovered
        border-width: 0px !important;
        border-radius: $cornerBorderRadius;
        position: relative;
        &:hover {
            background-color: #eee;
        }
    }
    &:hover {
        .oncoprintjs__track_options__toggle_btn_img,
        .oncoprintjs__header__toggle_btn_img {
            opacity: 1; // hide unless hovered
        }
    }

    .oncoprintjs__track_options__dropdown,
    .oncoprintjs__header__dropdown {
        border: 1px solid rgba(0, 0, 0, 0.15) !important;
        margin: 0 !important;
        padding: 0 !important;
        box-shadow: 0 6px 12px rgba(0, 0, 0, 0.175);
        border-radius: $cornerBorderRadius;
        z-index: 10000;
        li {
            &.oncoprintjs__track_options__separator,
            &.oncoprintjs__header__separator {
                border-top: 1px solid #dddddd !important;
            }
            &:not(.oncoprintjs__track_options__separator, .oncoprintjs__header__separator) {
                border-width: 0 !important;
            }
            padding: 2px 5px;
            &:hover {
                background: #fff !important;
                text-decoration: underline;
            }
        }
    }
}