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    // initiaize map, set position and zoom level
    var map = L.map('lab-map').setView([51.1642292, 10.4541194], 6);
    map.attributionControl.setPrefix("");
    map.scrollWheelZoom.disable();

    // basemap
    var mapboxLayer = L.tileLayer('https://{s}.tiles.mapbox.com/v4/codeforgermany.cc5365b0/{z}/{x}/{y}.png?access_token=pk.eyJ1IjoiY29kZWZvcmdlcm1hbnkiLCJhIjoiMVg2ZGdSSSJ9.JsM4S0LZpeNmI1rHQnCxig', {
        attribution: '<a href="https://www.mapbox.com/ab