Larger Planes and Selection Indication

My local map is pretty busy and I have a problem finding the planes. The selected plane is also not very clear. I doubled the plane size and put a red circle around the selected plane with these modified lines of gmap.html.

/* Give a border to the selected plane. */
if (Selected == plane.hex) {
selhtml = 'border:4px dotted; width: 35px; height: 35px;background-clip: text; border-color: red; border-radius:50% 50% 50% 50%;';
} else {
selhtml = '';
}
he = '

';
var icon = L.divIcon({html: he, className: 'plane-icon'});
return icon;

Obviously, the font size can be more finely adjusted with pixel sizes (e.g. font-size:30px;) or percentages and the circle can be changed to suite by changing the width and height.

Github don't allow html files to be attached and so I have renamed it gmap.txt

[gmap.txt](https://github.com/antirez/dump1090/files/6017478/gmap.txt)