Dropdown menu for floors

Hello!

I am trying to change the floors menu and make it a dropdown.
I saw that on mobile, that menu overlaps the map.
I found the js code and the css but I don’t seem to make it work

            this.addLevelSwitcher = function() {
                if (self.data.levels.length > 1) {
                    var control = $('<div></div>').addClass('mapplic-level-switcher');
                    self.data.levels.forEach(function(level, i) {
                        var button = $('<button></button>').attr('data-level', level.id).text(level.title).prependTo(control).click(function(e) {
                            e.preventDefault();
                            self.switchLevel(level.id);
                        });
                        if (level.show) button.addClass('mapplic-selected');
                    });

                    this.el.append(control);

                    self.el.on('levelswitched', function(e, target) {
                        $('button', control).removeClass('mapplic-selected');
                        $('button[data-level="' +  target + '"]', control).addClass('mapplic-selected');
                    });
                }
            }

And here it goes the CSS

/* new switcher */
.mapplic-level-switcher {
    position: absolute;
    right: 0;
    top: 0px;
    margin: 12px;
}

.mapplic-level-switcher button {
    background-color: #f8f8f8;
    border-radius: 0;
    color: #888;
    cursor: pointer;
    display: block;
    font-size: 11px;
    font-weight: 600;
    line-height: 20px;
    padding: 4px 10px;
    text-align: center;
    user-select: none;
    width: 100%;
    border: none;
    transition: transform 0.2s;
    position: relative;
}

.mapplic-level-switcher button:hover { background-color: #f8f8f8; }
.mapplic-level-switcher button:focus { outline: none; }

.mapplic-level-switcher button.mapplic-selected {
    box-shadow: 0 0 12px rgba(0, 0, 0, 0.06);
    background-color: #fff;
    color: #222;
    transform: scale(1.15);
    z-index: 100;
}