OpenAtlas

A simple and quick solution would be to use L.circleMarker instead of L.marker

e.g.

myCircleStyle = {
        "color": "#000000",
        "weight": 1,
        "fillOpacity": 0.8,
        "fillColor": "#007bd9",
        "radius": 10
    };
var marker = L.circleMarker([lon, lat], myCircleStyle).addTo(mymarkers).bindPopup('<a href="/entity/' + id + '">' + name + '</a>');